There are four times as many children as adults in a zoo. There are 102 more girls than boys. If there are 265 people in the zoo,
- how many children are there?
- how many boys are there?
- how many girls are there?
Children |
Adults |
Total |
4 u |
1 u |
5 u |
Boys |
Girls |
|
|
1 p |
1 p + 102 |
|
|
(a)
Number of adults = 1 u
Number of children = 4 x 1 u = 4 u
Total number of people
= 4 u + 1 u
= 5 u
5 u = 265
1 u = 265 ÷ 5 = 53
(a)
Number of children
= 4 u
= 4 x 53
= 212
(b)
Number of boys = 1 p
Number of girls = 1 p + 102
1 p + 1 p + 102 = 212
2 p + 102 = 212
2 p = 212 - 102
2 p = 110
1 p = 110 ÷ 2 = 55
Number of boys
= 1 p
= 55
(c)
Number of girls
= 1 p + 102
= 55 + 102
= 157
Answer(s): (a) 212; (b) 55; (c) 157