On Monday, there were 25 more children than adults at the bowling alley. On Tuesday, the number of children decreased by 60% and the number of adults decreased by 80%. There were 31 people on Tuesday. How many children were there on Tuesday?
| |
Children |
Adults |
Total |
Comparing children
and adults at first |
25 more |
|
|
| Before |
5 u |
+ 25 |
5 u |
|
| Change |
- 3 u |
- 15 |
- 4 u |
|
| After |
2 u |
+ 10 |
1 u |
31 |
60% =
60100 =
35 60% x 25 =
35 x 25 = 15
25 - 15 = 10
80% =
80100 =
45 Total number of people on Tuesday
= 2 u + 10 + 1 u
= 3 u + 10
3 u + 10 = 31
3 u = 31 - 10
3 u = 21
1 u = 21 ÷ 3 = 7
Number of children on Tuesday
= 2 u + 10
= 2 x 7 + 10
= 14 + 10
= 24
Answer(s): 24
