Question
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?
(b)If 16 pupils wear spectacles, how many pupils are there altogether?
Answers
Lianne
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.
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.
Steve
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