On Friday, there were 10 more children than adults at the funfair. On Saturday, the number of children increased by 90% and the number of adults increased by 70%. There were 199 people on Saturday. How many children were there on Friday?
| |
Children |
Adults |
Total |
Comparing children
and adults at first |
10 more |
|
|
| Before |
10 u |
+ 10 |
10 u |
|
| Change |
+ 9 u |
+ 9 |
+ 7 u |
|
| After |
19 u |
+ 19 |
17 u |
199 |
90% =
90100 =
910 90% x 10 =
910 x 10 = 9
10 + 9 = 19
70% =
70100 =
710 Total number of people on Saturday
= 19 u + 19 + 17 u
= 36 u + 19
36 u + 19 = 199
36 u = 199 - 19
36 u = 180
1 u = 180 ÷ 36 = 5
Number of children on Friday
= 10 u + 10
= 10 x 5 + 10
= 50 + 10
= 60
Answer(s): 60
