**31**. The heights of two boys are in the ratio of 4 : 5. The shorter boy is 80 cm. What is the height of the taller boy?

A. 100 cm

B. 150 cm

C. 164 cm

D. 180 cm

**32**. Factorise completely 5xy + 10ny

A. 5y(x + n)

B. 5y(x + 2n)

C. 5xy(1 + 2n)

D. 5(xy + 2n)

**33**. If 13x − 12 = 5x + 60, find x.

A. −9

B. −6

C. 9

D. 6

**34**. The length of a spring when a mass of **n** kg is hanged on it is L = (74 + 15n) mm. What is the length of the spring when a mass of 1.20 kg is hanged on it?

A. 75.2 mm

B. 89.00 mm

C. 92.00 mm

D. 97.00 mm

**35**. In the figure below, ∆ABC is an enlargement of ∆ADE. If |AE| = 20 cm, |EC| = 10 cm, what is the scale factor of the enlargement?

**36**. Which of the number lines below represents the inequality 2 < x ≤ 6?

A.

B.

C.

D.

**37**. A cylinder has a radius 6 cm and height 7 cm. Find its volume. Take

A. 132 cm^{3}

B. 264 cm^{3}

C. 294 cm^{3}

D. 792 cm^{3}

**38**.

The angles **a** and **b** in the figure above are

A. interior opposite

B. corresponding

C. vertically opposite

D. acute

**39**. A man travelled a distance of 1.2 km in 30 minutes. What distance can he cover in 55 minutes travelling at the same speed?

A. 1.375 km

B. 2.02 km

C. 2.2 km

D. 12.02 km

**40**.

In the diagram above ∆ABC is an isosceles triangle and ∠ABD is 108°. Find the value of y°.

A. 72

B. 60

C. 48

D. 36