On Saturday, there were 30 more children than adults at the fair. On Sunday, the number of children increased by 90% and the number of adults increased by 70%. There were 345 people on Sunday. How many children were there on Saturday?
| |
Children |
Adults |
Total |
Comparing children
and adults at first |
30 more |
|
|
| Before |
10 u |
+ 30 |
10 u |
|
| Change |
+ 9 u |
+ 27 |
+ 7 u |
|
| After |
19 u |
+ 57 |
17 u |
345 |
90% =
90100 =
910 90% x 30 =
910 x 30 = 27
30 + 27 = 57
70% =
70100 =
710 Total number of people on Sunday
= 19 u + 57 + 17 u
= 36 u + 57
36 u + 57 = 345
36 u = 345 - 57
36 u = 288
1 u = 288 ÷ 36 = 8
Number of children on Saturday
= 10 u + 30
= 10 x 8 + 30
= 80 + 30
= 110
Answer(s): 110
