On Monday, there were 25 more adults than children at the bowling alley. On Tuesday, the number of adults increased by 80% and the number of children decreased by 60%. There were 166 people on Tuesday. How many children were there on Monday?
| |
Adults |
Children |
Total |
Comparing adults
and children at first |
25 more |
|
|
| Before |
5 u |
+ 25 |
5 u |
|
| Change |
+ 4 u |
+ 20 |
- 3 u |
|
| After |
9 u |
+ 45 |
2 u |
166 |
80% =
80100 =
45 80% x 25 =
45 x 25 = 20
25 + 20 = 45
60% =
60100 =
35 Total number of people on Tuesday
= 9 u + 45 + 2 u
= 11 u + 45
11 u + 45 = 166
11 u = 166 - 45
11 u = 121
1 u = 121 ÷ 11 = 11
Number of children on Monday
= 5 u
= 5 x 11
= 55
Answer(s): 55
