Question

1)In a class of 44 pupils, 20 pupils wear spectacles . Find the ratio of the number of pupils who wear spectacles to the number of pupils who do not wear spectacles .

Answer 1

Answer:

5:12

Step-by-step explanation:

Let the number of pupils be n.  There are n/4 girls, hence 3n/4 boys.  

(4/9)*3n/4 = n/3 boys wear spectacles, so 3n/4 - n/3 = 9n/12 - 4n/12 = 5n/12 boys don't.  So the boys who don't wear spectacles, expressed as a fraction of the number of pupils in the class is 5/12.