The ratio of George's to Brandon's money is 7 : 9. The ratio of Brandon's to Pierre's money is 4 : 5. If George has $420, how much more does Pierre have than Brandon?
George |
Brandon |
Pierre |
7x4 |
9x4 |
|
|
4x9 |
5x9 |
28 u |
36 u |
45 u |
The amount that Brandon has is the repeated identity.
Use LCM to make it the same.
LCM of 9 and 4 = 36
Amount that George has = 28 u
28 u = 420
1 u = 420 ÷ 28 = 15
Amount that Pierre has more than Brandon
= 45 u - 36 u
= 9 u
= 9 x 15
= $135
Answer(s): $135