At a party,
25 of the people are adults. The remaining group of people is divided into girls and boys in the ratio of 2 : 5. Each girl is given 3 magnets and each boy is given 5 magnets. Each accompanying adult receives 8 magnets. Given that only 390 magnets are given away to girls and adults, how many more children are there than adults?
Girls |
Boys |
Adults |
3x7 |
2x7 |
2x3 |
5x3 |
|
6 u |
15 u |
14 u |
The number of children is repeated. Make the number of children the same. LCM of 3 and 7 is 21.
|
Girls |
Boys |
Adults |
Number |
6 u |
15 u |
14 u |
Value |
3 |
5 |
8 |
Total value |
18 u |
75 u |
112 u |
Number of magnets given away to girls and adults
= 18 u + 112 u
= 130 u
1 u = 390 ÷ 130 = 3
Number of children
= 6 u + 15 u
= 21 u
Number of more children than adults
= 21 u - 14 u
= 7 u
= 7 x 3
= 21
Answer(s): 21