a contractor has 8 trucks. some trucks carry a load of 10 tonnes and the other trucks carry a load of 5 tonnes. when all 8 trucks are filled, they contain a total of 70 tonnes. how many of each size of truck does the contractor own?
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x = 10 tonne and y = 5 tonne...x + y = 8 {trucks = trucks} and 10 x + 5 y = 70 ..{ tonnes = tonnes }...solve for x then y
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