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