Olivia has 5 erasers fewer than Tammy but 17 erasers more than Andy. The three children have 192 erasers altogether.
- How many erasers does Andy have?
- How many erasers does Tammy have?
(a)
Number of erasers Tammy has = 1 u
Number of erasers Olivia has = 1 u - 5
Number of erasers Andy has = 1 u - 5 - 17 = 1 u - 22
Total number of erasers
= 1 u + 1 u - 5 + 1 u - 22
= 3 u - 27
3 u - 27 = 192
3 u = 192 + 27
3 u = 219
1 u = 219 ÷ 3 = 73
Number of erasers that Andy has
= 1 u - 22
= 73 - 22
= 51
(b)
Number of erasers that Tammy has
= 1 u
= 73
Answer(s): (a) 51; (b) 73
