On Monday, there were 10 more adults than children at the funfair. On Tuesday, the number of adults decreased by 90% and the number of children decreased by 70%. There were 17 people on Tuesday. How many adults were there on Tuesday?
| |
Adults |
Children |
Total |
Comparing adults
and children at first |
10 more |
|
|
| Before |
10 u |
+ 10 |
10 u |
|
| Change |
- 9 u |
- 9 |
- 7 u |
|
| After |
1 u |
+ 1 |
3 u |
17 |
90% =
90100 =
910 90% x 10 =
910 x 10 = 9
10 - 9 = 1
70% =
70100 =
710 Total number of people on Tuesday
= 1 u + 1 + 3 u
= 4 u + 1
4 u + 1 = 17
4 u = 17 - 1
4 u = 16
1 u = 16 ÷ 4 = 4
Number of adults on Tuesday
= 1 u + 1
= 1 x 4 + 1
= 4 + 1
= 5
Answer(s): 5
