On Saturday, there were 20 more children than adults at the funfair. On Sunday, the number of children increased by 55% and the number of adults increased by 85%. There were 643 people on Sunday. How many children were there on Saturday?
| |
Children |
Adults |
Total |
Comparing children
and adults at first |
20 more |
|
|
| Before |
20 u |
+ 20 |
20 u |
|
| Change |
+ 11 u |
+ 11 |
+ 17 u |
|
| After |
31 u |
+ 31 |
37 u |
643 |
55% =
55100 =
1120 55% x 20 =
1120 x 20 = 11
20 + 11 = 31
85% =
85100 =
1720 Total number of people on Sunday
= 31 u + 31 + 37 u
= 68 u + 31
68 u + 31 = 643
68 u = 643 - 31
68 u = 612
1 u = 612 ÷ 68 = 9
Number of children on Saturday
= 20 u + 20
= 20 x 9 + 20
= 180 + 20
= 200
Answer(s): 200
