Question

Visitors to a cinema are either children, adults or pensioners. The ratio for children to adult viewers is 1 : 2 The ratio of adults to pensioners is 3 : 4 A stratified example of 85 is to be taken from the cinema visitors. How many pensioners should be in the sample?

Answer 1

Total number of pensioners = 40

Explanation:

Given:

Ratio for children to adult = 1 : 2

Ratio of adults to pensioners = 3 : 4

Total number of seats = 85

Find:

Total number of pensioners

Computation:

Common ration of children to adult to pensioners

1.5 : 3 : 4

In simple form

3 : 6 : 8

Total number of pensioners = Total number of seats [(8)/(3+6+8)]

Total number of pensioners = 85[(8)/(17)]

Total number of pensioners = 40