Oliver had
18 as many erasers as David. David had twice as many erasers as Cody. If Oliver had 138 erasers fewer than Cody,
- how many erasers did Oliver have?
- how many erasers did they have altogether?
(a)
Number of erasers that Oliver had = 1 u
Number of erasers that David had = 8 u
Number of erasers that Cody had = 8 u ÷ 2 = 4 u
Number of erasers that Oliver had fewer than Cody
= 4 u - 1 u
= 3 u
3 u = 138
1 u = 138 ÷ 3 = 46
Number of erasers that Oliver had
= 1 u
= 46
(b)
Total number of erasers that they had
= 1 u + 8 u + 4 u
= 13 u
= 13 x 46
= 598
Answer(s): (a) 46; (b) 598
