The Student Room Group

Density

The densities of three metal alloys, A, B and C, are in the ratio
9 : 13 : 17
1 of alloy B has a mass of 7400 kg.
Work out the difference between the mass of 7 of alloy A and 5 of alloy C.
Give your answer correct to 3 significant figures.
Please do post your thoughts or workings. But if you haven't had a clue on how to start...

I wonder if you have covered this, but the formula for density in spoiler:

Spoiler

Reply 2
Original post by username6076459
The densities of three metal alloys, A, B and C, are in the ratio
9 : 13 : 17
1 of alloy B has a mass of 7400 kg.
Work out the difference between the mass of 7 of alloy A and 5 of alloy C.
Give your answer correct to 3 significant figures.


"1 of alloy B has a mass of 7400 kg"... so can you deduce the density of B?
Then use the ratio information to find the densities of A and C?
Then use D=M/V to deal with the masses.

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