Irene had 144 erasers. Albert had 12 of what Irene had. After Irene used some of his erasers and Albert used 16 of his erasers, Irene had 13 as many erasers left as Albert.
- How many erasers did Albert have at first?
- How many erasers did Irene use?
| |
Irene |
Albert |
| Before |
144 |
72 |
| Change |
- ? |
- 12 |
| After |
20 |
60 |
(a)
Number of erasers that Albert had at first
=
12 x 144
= 72
(b)
Number of erasers that Albert used
=
16 x 72
= 12
Number of erasers that Albert had left
= 72 - 12
= 60
Number of erasers that Irene had left
=
13 x 60
= 20
Number of erasers that Irene used
= 144 - 20
= 124
Answer(s): (a) 72; (b) 124
