Asked by Favour
A bag contaions 78 boxes of staple pins of two sizes, large and small. Each large box weighs 10g and each small box weighs 7g. If the total weight of the boxes in the bag is 672g. How many of each type are in the bag?
Answers
Answered by
R_scott
L + S = 78 ... multiplying by 7 ... 7 L + 7 S = 546
10 L + 7 S = 672
subtracting equations (to eliminate S) ... 3 L = 672 - 546
solve for L , then substitute back to find S
10 L + 7 S = 672
subtracting equations (to eliminate S) ... 3 L = 672 - 546
solve for L , then substitute back to find S
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