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A total of 1541 shopping vouchers were given out at an event. Each man collected 2 vouchers, each woman collected 8 vouchers and each child collected 5 vouchers. Given that 3/7 of the people were men, 5/8 of the remainder were women and the rest were children, how many vouchers did the children collect?

 Oct 6, 2021
 #1
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  men*2               women *8                     children * 5

3/7x * 2      +    5/8 (4/7)* 8 x       +      3/8 (4/7) x * 5   = 1541          x = number of people at event

(6/7 + 160/56 + 60/56 ) x = 1541

x = 322

 

children vouchers = 3/8 * 4/7  *5 * 322  = 345 vouchers

 Oct 6, 2021
 #2
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3/7 = 6/14 (fraction of total that are men)

1 - 3/7 = 4/7 = 8/14 
(fraction of total that are women and children)

⅝ × 4/7 = 5/14 
(fraction of the total that are women)

1 - 4/7 - 5/14 = 1 - 6/14 - 5/14 = 6/14
(fraction of the total that are children)


This tells you that ratio of men to women to children
= 6 : 5 : 3


Men → 2 vouchers each
Women → 8 vouchers each
Children → 5 vouchers each


Next, grouping concept.


6 men, 5 women, 3 children in 1 group.

Number of vouchers in 1 group 
= 6 × 2 + 5 × 8 + 3 × 5 
= 12 + 40 + 15
= 67

Number of groups 
= 1541 ÷ 67
= 23

Number of children = 23 groups × 3 per group
= 69

Number of vouchers collected by them
= 69 × 5
= 345

 Oct 6, 2021

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