Weight - Alloy

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5 parts of tin and 16 parts of copper are an alloy of bell metal. A certain bell weighs 4200 pounds. Determine pounds of tin and copper.

What is known:

An alloy for bell metal consists of 5 parts tin and 16 parts copper.

Weight of a certain bell- 4200 pounds.

Want to know:

Pounds of tin and copper.

Let T = Tin
Let C = Copper

5T + 16C = 4200

5T/5 = 4200/5

T = 840

16C = 4200
16C/16 = 4200/16

C = 262.5

How do I proceed from here ?

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@Randy Dandy,

For every 21 parts, 5 are tin and 16 are copper. This means 5/21 of the total is tin. Can you figure it out from there?

1 Reply

@engineer,

5/21 is tin = .23809 = 24 %
16/21 is copper = .76109 = 76%

4200/21 = 200 pounds per part.

5 * 200 = 1000 pounds for 5 parts.

16 * 200 = 3200 pounds for 16 parts.

3200 + 1000 = 4200 pounds total.

??

Weight - Alloy

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