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Question

The mass of a pail is 2490g when it is 1/4 filled with sand. It has a mass of 9240g when it is fully filled with sand. Find the mass of the pail when it is empty?

Answer

This is a fractionall Simultaneous Equation. 

   R1  

R2  

 

 R2 – R1
Pail    1 1
Sand 1u 4u  3u
Weight  2490    9240  6750

3u   = 6750

1u = 6750 ÷ 3 = 2250

2490 – 2250 = 240 g

 

 

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