NECO Past Questions and Answers - Page 125

621.

Increase 135 in the ratio 3:5

A.

225

B.

216

C.

143

D.

140

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

622.

The ratio of the base area of a hollow cone to that of its curved surface is 1:4. If its base radius is 7cm, calculate the slant height of the cone

A.

7cm

B.

22cm

C.

28cm

D.

49cm

E.

154cm

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

623.

Calculate the area of a parallelogram whose diagonals are of length 8cm and 12cm and intersect at an angle of 135°

A.

271.5cm²

B.

135.8cm²

C.

96.0cm²

D.

48.0cm²

E.

33.9cm²

View answer & explanation

Correct answer is E

No explanation has been provided for this answer.

624.

Find the mean deviation of 20, 25, 21, 27, 28, 29, to the nearest whole number

A.

2

B.

3

C.

4

D.

5

E.

6

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

625.

x varies directly as y and inversely as z. when x = 5, y = 2 and z = 1. What is the value of x when y = 5 and z = 2?

A.

2.5

B.

5

C.

6.25

D.

6.52

E.

7.5

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

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