Jane had 120 pens. Mark had 12 of what Jane had. After Jane used some of his pens and Mark used 16 of his pens, Jane had 25 as many pens left as Mark.
- How many pens did Mark have at first?
- How many pens did Jane use?
| |
Jane |
Mark |
| Before |
120 |
60 |
| Change |
- ? |
- 10 |
| After |
20 |
50 |
(a)
Number of pens that Mark had at first
=
12 x 120
= 60
(b)
Number of pens that Mark used
=
16 x 60
= 10
Number of pens that Mark had left
= 60 - 10
= 50
Number of pens that Jane had left
=
25 x 50
= 20
Number of pens that Jane used
= 120 - 20
= 100
Answer(s): (a) 60; (b) 100
