ratios and proportions using decimals

Question

Real / Problem-solving 2p coins used to be made from a mix of copper, tin and zinc in the ratio 95 : 3.5 : 1.5. a A 2p coin had a mass of 7 g. What were the masses of copper, tin and zinc in the coin? b Sally had £1 in 2p pieces. What was the total mass of the coins?

Answer 1

I can't help you with part b, but the solution to part a is as follows.

What the proportions tell you is that the coins are 95% copper, 3.5% tin and 1.5% zinc.

You should be able to do the arithmetic to get the individsual masses.