Question

when acontainer is 1/4 filled with water it weighs 2.5kg. when it is completely filled with waterr it weighs 3.7kg.What is the weight of the empty container?

c + w/4 = 2.5 ... multiplying by 4 ... 4c + w = 10.

c + w = 3.7

solve the system for c (and w)

subtracting equations (to eliminate w) ... 3c = 6.3

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