On Friday, there were 20 more children than adults at the funfair. On Saturday, the number of children increased by 65% and the number of adults increased by 55%. There were 609 people on Saturday. How many children were there on Friday?
|
Children |
Adults |
Total |
Comparing children and adults at first |
20 more |
|
|
Before |
20 u |
+ 20 |
20 u |
|
Change |
+ 13 u |
+ 13 |
+ 11 u |
|
After |
33 u |
+ 33 |
31 u |
609 |
65% =
65100 =
1320 65% x 20 =
1320 x 20 = 13
20 + 13 = 33
55% =
55100 =
1120 Total number of people on Saturday
= 33 u + 33 + 31 u
= 64 u + 33
64 u + 33 = 609
64 u = 609 - 33
64 u = 576
1 u = 576 ÷ 64 = 9
Number of children on Friday
= 20 u + 20
= 20 x 9 + 20
= 180 + 20
= 200
Answer(s): 200