The ratio of Harry's to David's money is 7 : 10. The ratio of David's to Simon's money is 3 : 4. If Harry has $294, how much less does David have than Simon?
| Harry |
David |
Simon |
| 7x3 |
10x3 |
|
| |
3x10 |
4x10 |
| 21 u |
30 u |
40 u |
The amount that David has is the repeated identity.
Use LCM to make it the same.
LCM of 10 and 3 = 30
Amount that Harry has = 21 u
21 u = 294
1 u = 294 ÷ 21 = 14
Amount that David has less than Simon
= 40 u - 30 u
= 10 u
= 10 x 14
= $140
Answer(s): $140
