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WAEC Mathematics Past Questions & Answers - Page 112

556.

Make p the subject of the relation: q = 3pr+s2

A.

p = 2qrs6

B.

p = 2qr - sr - 3

C.

p = 2qrs6

D.

p = 2qrrs6

Correct answer is D

q = 3pr+s2

q = 6p+rs2r

6p + rs = 2qr

6p = 2qr - rs

p = 2qrrs6

557.

Simplify: 54k263k+1

A.

6(1 - 3k2)

B.

6(3k2 - 1)

C.

6(3k - 1)

D.

6(1 - 3k)

Correct answer is C

54k263k+1=6(9k21)3k+1

= 6(3k+1)(3k1)3k+1

= 6(3k - 1)

558.

Solve for x in the equation; 1x+23x=13

A.

5

B.

4

C.

3

D.

1

Correct answer is A

18+23x=13

= 12

53x=13

3x = 15

x = 153

= 5

559.

If N2,500.00 amounted to N3,50.00 in 4 years at simple interest, find the rate at which the interest was charged

A.

5%

B.

712%

C.

8%

D.

10%

Correct answer is D

A = 3,500, P = N2,500

A = P + I

But I = N3,500 - N2,500

I = N1,000

I = PRT100

N1,000 = 2.500×R×4100

1000 = 100R

R = 1000100

= 10%

560.

Mr. Manu travelled from Accra to Pamfokromb a distance of 720km in 8 hours. What will be his speed in m/s?

A.

25m/s

B.

150m/s

C.

250m/s

D.

500m/s

Correct answer is A

720×10008×60×60 = 20×108

= 2008

= 25 m/s