Oscar had
18 as many erasers as Jenson. Jenson had twice as many erasers as Jeremy. If Oscar had 90 erasers fewer than Jeremy,
- how many erasers did Oscar have?
- how many erasers did they have altogether?
(a)
Number of erasers that Oscar had = 1 u
Number of erasers that Jenson had = 8 u
Number of erasers that Jeremy had = 8 u ÷ 2 = 4 u
Number of erasers that Oscar had fewer than Jeremy
= 4 u - 1 u
= 3 u
3 u = 90
1 u = 90 ÷ 3 = 30
Number of erasers that Oscar had
= 1 u
= 30
(b)
Total number of erasers that they had
= 1 u + 8 u + 4 u
= 13 u
= 13 x 30
= 390
Answer(s): (a) 30; (b) 390
