NECO Mathematics Past Questions & Answers - Page 6

26.

2 bags of sugar at Nx per bag are mixed with 3 bags of sugar at Ny per bag. What is the cost in N of the mixture per bag?

A.

\(\frac{(2x + 3y)}{5}\)

B.

\(\frac{(x + y)}{2}\)

C.

\(\frac{x}{2} +\frac{y}{3}\)

D.

\(\frac{(x + y)}{5}\)

E.

\(\frac{(3x + 2y)}{5}\)

Correct answer is A

No explanation has been provided for this answer.

28.

A man travels at a rate of 25m/sec. If he travels for 10½hrs, how many kilometres has he covered?

A.

262.5

B.

945

C.

970

D.

995

E.

1822.9

Correct answer is B

No explanation has been provided for this answer.

29.

The radii of two similar cylindrical jugs are in the ratio 3:7. Calculate the ratio of their volumes

A.

1 : 04

B.

3 : 07

C.

9 : 49

D.

0.086111111

E.

27 : 343

Correct answer is E

radius ratio volume

r = \(r^3\)

so that 

3 : 7 = \(3^3 : 7^3\) = 27 : 343

30.

Simplify the expression:  \(Log_{4}16\) +  \(Log_{3}27\) + \(Log_{8}4096\) 

A.

-9

B.

\(\frac{1}{3}\)

C.

\(\frac{1}{9}\)

D.

3

E.

9

Correct answer is E

WHERE:

\(Log_{4}16\) = 2

\(Log_{3}27\) = 3

\(Log_{8}4096\) = 4

: 2 + 3 + 4 = 9