Differences in Ratios
Maths: Edexcel GCSE Higher, topic 3.8.1
Differences in Ratios
There are green and blue pens in a pencil case in the ratio 4 : 3. There are 5 more green pens than blue pens. How many green pens are there?
Green pens : blue pens = 4 : 3
Difference corresponds to 1 part
Therefore 1 part is 5 pens
4 parts are green pens so there are 20 green pens
Test yourself on Differences in Ratios
There are £1 coins and £2 coins on a desk in the ratio 5 : 3. If there are 10 more £1 coins than £2 coins, what is the value of 1 part in this ratio?
There are £1 coins and £2 coins on a desk in the ratio 8 : 4. If there are 20 more £1 coins than £2 coins, what is the value of 1 part in this ratio?
There are £1 coins and £2 coins on a desk in the ratio 6 : 1. If there are 15 more £1 coins than £2 coins, what is the value of 1 part in this ratio?