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