An alloy contains only zinc and copper and they are in the ratio of 7:9. If the weight of the alloy is 8kg, then find the weight of copper in the alloy.

In Fig. 8.4, the comparative areas of the continents are given:

What is the ratio of the areas of

(a) Africa to Europe

(b) Australia to Asia

(c) Antarctica to Combined area of North America and South America.

A tea merchant blends two varieties of tea costing her Rs 234 and Rs 130 per kg in the ratio of their costs. If the weight of the mixture is 84kg, then find the weight of each variety of tea.

In the following figure, each division represents 1cm:

Express numerically the ratios of the following distances:

(i) AC : AF (ii) AG : AD

(iii) BF : AI (iv) CE : DI

Find two numbers whose sum is 100 and whose ratio is 9 :16.