a) 2/5ths of the pupils are wearing spectacles.
b) 2/5 = 0.4. 1/5 = 0.2. So you can tell, 0.2 is half of 0.4, meaning 1/5th is half of 16, meaning 8. You can then multiply 8 by 5 to get 40 - the number of students in the class.
In a class 2/5 of the pupils wear sprctacles.(a)What fraction of the pupils do not wear spectacles?
(b)If 16 pupils wear spectacles, how many pupils are there altogether?
2 answers
a) 1 - 2/5 = 3/5 who do not wear specs
b) 16 = 2/5 x
x = 16 * 5/2 = 40
b) 16 = 2/5 x
x = 16 * 5/2 = 40
1 answer