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 By: Test Paper (offline)  Wednesday, October 19 2011 @ 11:35 AM CDT (Read 1168 times)
Test Paper

A tank contains some oil and water.
The ratio of the voilume of oil to the volume of water in the tank is 4:3.
After Joanne pours 60 ml of water into the tank and removes 95 ml of oil from it,
the ratio of the volume of oil to the volume of water is 3:4.
Find the volume of oil in the tank at first.

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Registered: 09/23/11
Posts: 2

 By: GIM (offline)  Thursday, October 27 2011 @ 12:18 AM CDT
GIM

At first :
Oil : Water
4 : 3

After :
4units - 95ml / 3units + 60 ml = 3units / 4 units
4 x (4u - 95) = 3 x (3u + 60)
16u - 380 = 9u + 180
16u - 9u = 180 + 380
7u = 560
1u = 560/ 7 = 80 ml

Oil at first --- 4u x 80 = 320ml (answer)

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Registered: 11/07/10
Posts: 70

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