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Sam packed 320 marbles into four boxes, labelled A, B, C and D. Box A had the most

number of marbles and Box D had the least. The difference in the number of marbles
between Box A and the number of marbles in the other three boes were 8, 13 and 19.
How many marbles were there in Box D?

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1 answer
  1. A + (A-8) + (A-13)+ (A-19) = 320
    4 A - 40 = 320
    4 A = 360
    A = 90
    90 - 19 = 71

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