# WAEC Mathematics 2020 Answers Essay & Obj Questions Finally Out

## 2020 WAEC Mathematics Answers Released – See Correct Waec Mathematics Questions for Objectives & Essay Here.

The Waec mathematics 2020 questions and answers have been released. The West African Examination Council (WAEC) General Mathematics essay and objective paper for SSCE will now be written on Monday, 17th August.

The WAEC Maths 2 (Essay) paper will start by 8:30 am and will last for 2hrs 30mins while the Waec Mathematics 1 (Objective) exam will commence at 4:00pm and will last for 1hr 30mins. In this post, you will be seeing the Waec Maths questions and answers 2020 for candidates that will participate in the examination from past questions.

The questions and answers below on WAEC Mathematics have been provided to assist candidates understand the required standards expected in WAEC Mathematics Examination.

### WAEC Mathematics Question and Answer:

PAPER 2 [Essay]

1. A sector of a circle with radius 21 cm has an area of 280 cm2.
(a) Calculate, correct to 1 decimal place, the perimeter of the sector.
(b) If the sector is bent such that its straight edges coincide to form a cone, calculate, correct to the nearest degree, the vertical angle of the cone. [Take π = 22/7 ]

2. (a) Solve the equation:

(b)

In the diagram, < STQ = m, < TUQ = 800, < UPQ = r, < PQU = n and < RQT = 880. Find the value of (m + n).

1. A = {2, 4, 6, 8}, B = {2, 3, 7, 9} and C = {x: 3 < x < 9} are subsets of the universal-set
U = {2, 3, 4, 5, 6, 7, 8, 9}. Find
(a) A n(B’nC’);
(b) (AuB) n(BuC).

2. (a) The angle of depression of a boat from the mid-point of a vertical cliff is 35°. If the boat is 120 m from the foot of the cliff, calculate the height of the cliff.
(b) Towns P and Q are x km apart. Two motorists set out at the same time from P to Q at steady speeds of 60 km/h and 80 km/h. The faster motorist got to Q 30 minutes earlier than the other. Find the value of x.

5.

1. In a class of 40 students, 18 passed Mathematics, 19 passed Accounts, 16 passed Economics, 5 passed Mathematics and Accounts only, 6 passed Mathematics only, 9 passed Accounts only, 2 Accounts and Economics only. If each student offered at least one of the subjects,
(a) How many students failed in all the subjects?
(b) Find the percentage number who failed in at least one of Economics and Mathematics.
(c) Calculate the probability that a student selected at random failed in Accounts.

2. (a) Using completing the square method, solve, correct to 2 decimal places, the equation 3y2 – 5y +  2 = 0
(b) Given that M=

3. (a) P varies directly as Q and inversely as the square of R.  If P = 1 when Q = 8 and R = 2, find the value of Q when P = 3 and R = 5.

(b) An aeroplane flies from town A(20oN, 60oE) to town B(20oN, 20oE).
(i) If the journey takes 6 hours, calculate, correct to 3 significant figures, the average speed of the aeroplane.
(ii) If it then flies due north from town B to town C, 420 km away, calculates, correct to the nearest degree, the latitude of town C.
[Take radius of the earth = 6400 km and  π = 3.142]

1. Two fair dice are thrown.
M is the event described by “the sum of the scores is 10” and
N is the event described by “the difference between the scores is 3”.
(a) Write out the elements of M and N.
(b) Find the probability of M or N.
(c) Are M and N mutually exclusive? Give reasons.

2. (a) In a class of 50 students, 30 offered History, 15 offered History and Geography while 3 did not offer any of the two subjects.
(i) Represent the information on a Venn diagram.
(ii) Find the number of candidates that offered: History only; Geography only.
(b) A trader sold an article at a discount of 8% for N 828.00. If the article was initially marked to gain 25%, find the
(i) the cost price of the article;
(ii) discount allowed.

3. The area of a rectangular football field is 7200m2 while its perimeter is 360m.  calculate the:
(a) dimensions of the field;
(b) cost of clearing the field at N6.50 per square meter, leaving a margin of 2m wide along the longer sides;
(c) percentage of the part not cleared.

4. Using a ruler and a pair of compasses only,
(a) construct a rhombus PQRS of side 7 cm and ÐPQR = 60o;
(b) locate point X such that X lies on the locus of points equidistant from PQ and QR and also equidistant from Q and R;
(c) measure /XR/.

12.

#### WAEC Mathematics Objective Question:

PAPER 1 (Objective)
Answer ALL questions in this section.

1. In a school, 180 students offer mathematics or physics or both. If 125  offer mathematics and 105 offer physics. How many students offer mathematics only?
A.75       B. 80       C. 55       D. 125.

2. Find the value of x for which 3(24x + 3) = 96
A. 2       B. -2       C. ½       D. -1/2

3. The cost of renovating a 5m square room is N500. What is the cost of renovating a 10m square room?
A. N1,000       B. N2,500       C. 2,000       D. N10,000

1. Find the rate of change of the total surface area S of a sphere with respect to its radius r when r = 2
A. 8       B. 16       C. 10       D. 14

2. Differentiate (cosӨ + sinӨ)2 with respect to Ө.
A. 2cos2Ө       B. 2sin2Ө       C. -2cos2Ө       D. -2sin2Ө

3. A binary operation * on the set of rational numbers is defined as x * y = 2x + [x3 – y3/x + y]. find -1*2
A. 11       B. -11       C. 8       D. -8

4. A polynomial in x whose zeroes are 2, 1 and -3 is ______
A. x3 – 7x + 6
B. x3 + 7x – 6
C. x3 – 7x –  6
D. x3 + 7x + 6

5. Find the range of values of x for which 7x –  3 > 3x + 4
A. x < 7/4
B. x > 7/4
C. 7x < 4
D. -4x < 7

9. Some red balls were put in a basket containing 12 white balls and 16 blue balls. If the probability of picking a red ball from the basket is 3/7, how many red balls were introduced?
A. 13       B.20       C. 12       D. 21

1. Convert 12314 to a number in base 6.
A. 1056
B. 3016
C. 1036
D. 5016

2. Find the slope of the curve y = 3x3 + 5x2 – 3 at (-1, 5).
A. 1       B. -1       C. 19       D. -19

3. Find the area of the region bounded by y = x2 + x – 2 and x-axis.
A. 9/2         B. -39/6         C. 8/3          D. 16/3

4. The minimum value of y = x2 – 4x – 5 is ______
A. 2          B. -2         C.13          D. -13

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