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12 May, 04:30

Shaun needs to make mortar for brick-laying. It is made in the ratio 7:3 of sand to cement.

If 210 kg of sand is used, how much cement is needed?

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  1. 12 May, 07:40
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    Sand to cement

    7:3

    210:x

    ask yourself what number is needed to multiply by 7 to get 210 (so you'd divide 210 by 7 which is 30). Multiply the other side by thirty as well to get the value of x

    3*30 which is 90
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