On Friday, there were 20 more children than adults at the fair. On Saturday, the number of children increased by 70% and the number of adults increased by 90%. There were 394 people on Saturday. How many children were there on Friday?
| |
Children |
Adults |
Total |
Comparing children
and adults at first |
20 more |
|
|
| Before |
10 u |
+ 20 |
10 u |
|
| Change |
+ 7 u |
+ 14 |
+ 9 u |
|
| After |
17 u |
+ 34 |
19 u |
394 |
70% =
70100 =
710 70% x 20 =
710 x 20 = 14
20 + 14 = 34
90% =
90100 =
910 Total number of people on Saturday
= 17 u + 34 + 19 u
= 36 u + 34
36 u + 34 = 394
36 u = 394 - 34
36 u = 360
1 u = 360 ÷ 36 = 10
Number of children on Friday
= 10 u + 20
= 10 x 10 + 20
= 100 + 20
= 120
Answer(s): 120
