WAEC Past Questions and Answers - Page 3799

18,991.

If q oranges are sold for t Naira, how many oranges can be bought for p naira?

A.

\(\frac{p}{2}t\)

B.

\(\frac{qt}{p}\)

C.

\(\frac{q}{pt}\)

D.

\(\frac{pq}{t}\)

Correct answer is D

q oranges = t naira

1 naira = \(\frac{q}{t}\)

p naira = \(p(\frac{q}{t})\)

= \(\frac{pq}{t}\) oranges

18,992.

Factorize m(2a-b)-2n(b-2a)

A.

(2a-b)(2n-m)

B.

(2a+b)(m-2n)

C.

(2a-b)(m+2n)

D.

(2a-b)(m-2n)

Correct answer is C

m(2a - b) - 2n(b - 2a)

= m(2a - b) - (-2n)(2a - b)

= m(2a - b) + 2n(2a - b)

= (m + 2n)(2a - b)

18,993.

Simplify \(3\sqrt{12} + 10\sqrt{3} - \frac{6}{\sqrt{3}}\)

A.

\(7\sqrt{3}\)

B.

\(10\sqrt{3}\)

C.

\(14\sqrt{3}\)

D.

\(18\sqrt{3}\)

Correct answer is C

\(3\sqrt{12} + 10\sqrt{3} - \frac{6}{\sqrt{3}}\)

= \(3(\sqrt{4 \times 3}) + 10\sqrt{3} - (\frac{6}{\sqrt{3}})(\frac{\sqrt{3}}{\sqrt{3}})\)

= \(6\sqrt{3} + 10\sqrt{3} - 2\sqrt{3}\)

= \(14\sqrt{3}\)

18,994.

The volume of a cylinder of radius 14cm is 210cm3. What is the curved surface area of the cylinder?

A.

15cm2

B.

30cm2

C.

616cm2

D.

1262cm2

Correct answer is B

\(V = \pi r^2 h\\
210 = \frac{22}{7} \times 14^2 \times h \\
h = \frac{210}{22 \times 28}\)
Curved surface area \(= 2r\pi h\\
= 2 \times \frac{22}{7} \times 14 \times \frac{210}{22 \times 26} = 30cm^2\)

18,995.

Inflation in any economy

A.

Has no monetary connection

B.

Implies a sustained decrease in the general price level

C.

Always increase the value of national currency

D.

Tends to redistribute income arbitrarily

E.

Tends to bring down market prices

Correct answer is D

No explanation has been provided for this answer.