Harry has four times as many erasers as Ken. Ken has 5 more erasers than Riordan. They have a total of 55 erasers.
- How many erasers does Harry have?
- How many erasers does Riordan have?
(a)
Number of erasers that Ken has = 1 u
Number of erasers that Riordan has = 1 u - 5
Number of erasers that Harry has = 4 u
Total number of erasers
= 1 u + 1 u - 5 + 4 u
= 6 u - 5
6 u - 5 = 55
6 u = 55 + 5
6 u = 60
1 u = 60 ÷ 6 = 10
Number of erasers that Harry has
= 4 u
= 4 x 10
= 40
(b)
Number of erasers that Riordan has
= 1 u - 5
= 10 - 5
= 5
Answer(s): (a) 40; (b) 5