Zara had 144 erasers. Sean had 12 of what Zara had. After Zara used some of his erasers and Sean used 16 of his erasers, Zara had 23 as many erasers left as Sean.
- How many erasers did Sean have at first?
- How many erasers did Zara use?
| |
Zara |
Sean |
| Before |
144 |
72 |
| Change |
- ? |
- 12 |
| After |
40 |
60 |
(a)
Number of erasers that Sean had at first
=
12 x 144
= 72
(b)
Number of erasers that Sean used
=
16 x 72
= 12
Number of erasers that Sean had left
= 72 - 12
= 60
Number of erasers that Zara had left
=
23 x 60
= 40
Number of erasers that Zara used
= 144 - 40
= 104
Answer(s): (a) 72; (b) 104
