Luis has four times as many erasers as Oscar. Oscar has 9 more erasers than Tom. They have a total of 69 erasers.
- How many erasers does Luis have?
- How many erasers does Tom have?
(a)
Number of erasers that Oscar has = 1 u
Number of erasers that Tom has = 1 u - 9
Number of erasers that Luis has = 4 u
Total number of erasers
= 1 u + 1 u - 9 + 4 u
= 6 u - 9
6 u - 9 = 69
6 u = 69 + 9
6 u = 78
1 u = 78 ÷ 6 = 13
Number of erasers that Luis has
= 4 u
= 4 x 13
= 52
(b)
Number of erasers that Tom has
= 1 u - 9
= 13 - 9
= 4
Answer(s): (a) 52; (b) 4
