
2.5 Class Quiz 14: Scale and Proportion
Quiz by Ms Choi
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Jason saves $4 each day. How long does he take to save$32?
The weight of metal cube A of side 3 cm is 350 g. What will be the weight of metal cube B of side 6 cm? (Assume that the weight of a metal cube and its volume are in direct proportion.)
A lorry can travel 90 km by consuming 4.2 L of petrol. How far can the lorry travel with16.1 L of petrol?
10 pumps are used to empty a water tank in 1 minute and 39 seconds. How many pumps are needed to empty the tank in 55 seconds? (Assume that water is pumped away by each pump at the same rate.)
The scale of a map is 1 : 50 000. If the length of a river on the map is 13.5 cm, what is its actual length?
The figure below shows a photo of a snowman with a scale of 1 : 15. If the diameter of the snowman’s head in the photo is 2.1 cm, find its actual diameter.

The figure shows a scale drawing of a cup.The height of the cup in the drawing is 2.4 cm. If the actual height of the cup is 9.6 cm, find the scale of the drawing.

Express the scale 4 m : 25 mm in the form 1 : n.
On a photo with a scale of 3 cm : 1 mm, the length of an insect is 6 mm. Find the actual length of the insect.