On Thursday, there were 20 more children than adults at the trampoline park. On Friday, the number of children increased by 85% and the number of adults increased by 65%. There were 527 people on Friday. How many children were there on Thursday?
| |
Children |
Adults |
Total |
Comparing children
and adults at first |
20 more |
|
|
| Before |
20 u |
+ 20 |
20 u |
|
| Change |
+ 17 u |
+ 17 |
+ 13 u |
|
| After |
37 u |
+ 37 |
33 u |
527 |
85% =
85100 =
1720 85% x 20 =
1720 x 20 = 17
20 + 17 = 37
65% =
65100 =
1320 Total number of people on Friday
= 37 u + 37 + 33 u
= 70 u + 37
70 u + 37 = 527
70 u = 527 - 37
70 u = 490
1 u = 490 ÷ 70 = 7
Number of children on Thursday
= 20 u + 20
= 20 x 7 + 20
= 140 + 20
= 160
Answer(s): 160
