On Saturday, there were 20 more children than adults at the bowling alley. On Sunday, the number of children decreased by 65% and the number of adults decreased by 85%. There were 67 people on Sunday. How many children were there on Sunday?
| |
Children |
Adults |
Total |
Comparing children
and adults at first |
20 more |
|
|
| Before |
20 u |
+ 20 |
20 u |
|
| Change |
- 13 u |
- 13 |
- 17 u |
|
| After |
7 u |
+ 7 |
3 u |
67 |
65% =
65100 =
1320 65% x 20 =
1320 x 20 = 13
20 - 13 = 7
85% =
85100 =
1720 Total number of people on Sunday
= 7 u + 7 + 3 u
= 10 u + 7
10 u + 7 = 67
10 u = 67 - 7
10 u = 60
1 u = 60 ÷ 10 = 6
Number of children on Sunday
= 7 u + 7
= 7 x 6 + 7
= 42 + 7
= 49
Answer(s): 49
