Sarah had 135 erasers. Daniel had 23 of what Sarah had. After Sarah used some of his erasers and Daniel used 15 of his erasers, Sarah had 12 as many erasers left as Daniel.
- How many erasers did Daniel have at first?
- How many erasers did Sarah use?
|
Sarah |
Daniel |
Before |
135 |
90 |
Change |
- ? |
- 18 |
After |
36 |
72 |
(a)
Number of erasers that Daniel had at first
=
23 x 135
= 90
(b)
Number of erasers that Daniel used
=
15 x 90
= 18
Number of erasers that Daniel had left
= 90 - 18
= 72
Number of erasers that Sarah had left
=
12 x 72
= 36
Number of erasers that Sarah used
= 135 - 36
= 99
Answer(s): (a) 90; (b) 99