1.

Sand and cement are mixed in the ratio 1.7:1.9 tomake a slab of concrete. If the slab of concrete weighs31 kg 104 g, how much sand was used to make it?

Answer»

let the amount of sand be 1.7x and amount of concrete be 1.9x so, total weight is (1.7+1.9)x = 31.104kg => 3.6x = 31.104 so, x = 31.104/3.6 = 8.64kg therefore , the amount of sand is 1.7x = 1.7*8.64 = 14.688 kg.


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