Ratios, Rates and Proportions

Given that a : b = 2 : 5 and b : c = 5 : 4, find a : b : c.

• 2 : 5 : 4

• 2 : 10 : 4

• 5 : 2 : 4

• 4 : 5 : 2

Convert RM 2.70/min to sen/s.

• 45 sen/s

• 4.5 sen/s

• 0.45 sen/s

• 0.045 sen/s

Given that x : y = 2 : 9. If x = 18, y = ?

• 36

• 54

• 72

• 81

a : b : c = 2 : 7 : 8 and the value of b = 35. Find the value of a + c.

• 10

• 40

• 45

• 50

Is 4 : 6 equivalent to 22 : 33 ?

• Yes

• No

State 17 mm to 1.2 cm to 2 cm in the form of a : b : c

• 17 : 1.2 : 2

• 17 : 1.2 : 20

• 17 : 12 : 20

• 170 : 12 : 20

Determine the ratio of the shaded region to unshaded region.

• 5 : 10

• 1 : 2

• 5 : 5

• 10 : 5

Determine the rate for the following situation.

Sam drove his car for a distance of 225 km in 2.5 hours. Find the speed, in km per hour, of his car.

• 9 km/h

• 19 km/h

• 90 km/h

• 900 km/h

The selling price of 4 coconuts is RM10. If Azizah buys 6 coconuts, how much does she need to pay?

• RM 20

• RM 24

• RM 15

• RM10

Inside Michelle's stationery box, there are 50 pens. 20 are blue pens, 8 are red pens, 10 are black pems amd the remainder ore purple pens. Determine the percentage of purple pens inside Michelle's stationery box.

• 12%

• 20%

• 22%

• 24%