On Monday, there were 20 more children than adults at the laser tag park. On Tuesday, the number of children increased by 65% and the number of adults increased by 85%. There were 383 people on Tuesday. How many children were there on Monday?
|
Children |
Adults |
Total |
Comparing children and adults at first |
20 more |
|
|
Before |
20 u |
+ 20 |
20 u |
|
Change |
+ 13 u |
+ 13 |
+ 17 u |
|
After |
33 u |
+ 33 |
37 u |
383 |
65% =
65100 =
1320 65% x 20 =
1320 x 20 = 13
20 + 13 = 33
85% =
85100 =
1720 Total number of people on Tuesday
= 33 u + 33 + 37 u
= 70 u + 33
70 u + 33 = 383
70 u = 383 - 33
70 u = 350
1 u = 350 ÷ 70 = 5
Number of children on Monday
= 20 u + 20
= 20 x 5 + 20
= 100 + 20
= 120
Answer(s): 120