Bobby, Mark and Perry had a total of 570 stamps at first. After a week, the number of Bobby's stamps became 4 times the number of stamps he had at first. The number of Mark's stamps decreased by 234. Perry had one-quarter as many stamps as he had at first. In the end, the three boys had the same number of stamps.
- How many stamps did Perry have at first?
- What was the total number of stamps that the three boys had in the end?
|
Bobby |
Mark |
Perry |
Total |
Before |
1 u |
4 u + 234 |
16 u |
|
Change |
x 4 |
- 234 |
x 14 |
|
After |
4 u |
4 u |
4 u |
12 u |
(a)
Total number of stamps at first
=
1 u + 4 u + 234 + 16 u
= 21 u + 234
21 u + 234 = 57021 u = 570 - 23421 u = 336
1 u = 336 ÷ 21 = 16 Number of stamps that Perry had at first
= 4 u ÷
14= 4 u x
41= 16 u = 16 x 16 = 256(b)Total number of stamps that the three boys had at the end = 12 u = 12 x 16 = 192 Answer(s): (a) 256; (b) 192