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Friday, March 24 2017 @ 10:58 AM CDT
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 Help Needed For P5 Maths Problem SA2
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By: Test Paper (offline)  Wednesday, October 19 2011 @ 11:35 AM CDT (Read 1109 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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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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