Shannon had 280 coins. Riordan had 310 of what Shannon had. After Shannon used some of his coins and Riordan used 17 of his coins, Shannon had 14 as many coins left as Riordan.
- How many coins did Riordan have at first?
- How many coins did Shannon use?
|
Shannon |
Riordan |
Before |
280 |
84 |
Change |
- ? |
- 12 |
After |
18 |
72 |
(a)
Number of coins that Riordan had at first
=
310 x 280
= 84
(b)
Number of coins that Riordan used
=
17 x 84
= 12
Number of coins that Riordan had left
= 84 - 12
= 72
Number of coins that Shannon had left
=
14 x 72
= 18
Number of coins that Shannon used
= 280 - 18
= 262
Answer(s): (a) 84; (b) 262