At a race,
45 of the number of girls is equal to
13 of the number of boys. The number of adults at the race is five times the number of children. The number of coupons given to each adult, girl and boy at the race is 5, 4 and 3 respectively. The total number of coupons given at the race is 4810.
- What is the total number of coupons given to the adults?
- What is the number of boys at the race?
(a)
Make the numerators the same.
45 of the girls =
13 of the boys
45 of the girls =
412 of the boys
|
Girls |
Boys |
Adults |
Number |
5 u |
12 u |
85 u |
Value |
4 |
3 |
5 |
Total value |
20 u |
36 u |
425 u |
Number of children
= 5 u + 12 u
= 17 u
Number of adults
= 5 x 17 u
= 85 u
Total number of coupons given at the race
= 20 u + 36 u + 425 u
= 481 u
481 u = 4810
1 u = 4810 ÷ 481 = 10
Total number of coupons given to adults
= 425 u
= 425 x 10
= 4250
(b)
Number of boys in the race
= 12 u
= 12 x 10
= 120
Answer(s): (a) 4250; (b) 120