Write the ratio 𝑥 : 𝑦 in the form 𝑛 : 1. Divide both sides of 7 : 2 by 2 to give 3·5 : 1. For every one 𝑦, there are 3·5 𝑥. This means 𝑥 is 3·5 times bigger than 𝑦.