Question 1204645
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f = amount of flour left
2f = amount of rice left
x = amount of each item sold
f+2f+x+x = 142
3f+2x = 142


"The amount of rice sold was 20 kg less than the amount of rice left"
x = 2f - 20


3f+2x = 142
3f+2( x ) = 142
3f+2(2f-20) = 142
3f+4f-40 = 142
7f-40 = 142
7f = 142+40
7f = 182
f = 182/7
f = 26


x = 2f - 20
x = 2*26 - 20
x = 52 - 20
x = 32 
2f+x = 2*26+32 = 52+32 = 84



Answers
32 kg of flour sold
84 kg of rice at first
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