On Thursday, there were 40 more children than adults at the funfair. On Friday, the number of children decreased by 85% and the number of adults decreased by 55%. There were 138 people on Friday. How many children were there on Friday?
| |
Children |
Adults |
Total |
Comparing children
and adults at first |
40 more |
|
|
| Before |
20 u |
+ 40 |
20 u |
|
| Change |
- 17 u |
- 34 |
- 11 u |
|
| After |
3 u |
+ 6 |
9 u |
138 |
85% =
85100 =
1720 85% x 40 =
1720 x 40 = 34
40 - 34 = 6
55% =
55100 =
1120 Total number of people on Friday
= 3 u + 6 + 9 u
= 12 u + 6
12 u + 6 = 138
12 u = 138 - 6
12 u = 132
1 u = 132 ÷ 12 = 11
Number of children on Friday
= 3 u + 6
= 3 x 11 + 6
= 33 + 6
= 39
Answer(s): 39
