Chpater 6 Ratio and proportion

Tin and copper are mixed in the ratio 8:3.

How much tin is needed to mix with 36g of copper?

A factory produces cars in red, blue, white and green in the ratio 7:5:3:1.

Out of a production of 48 000 cars, how many are white?

Jemuma is 5 years old, Karl is 8 and Lonnie is 11.

They are sharing some money in the ratio of their ages.

If Karl gets $5.60, what is the total amount of money they are sharing?