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Bob the builder is making 480 kg of concrete mix. Concrete is made by mixing cement, sand and gravel in the ratio 1 : 3 : 4 how much sand does he need ?

 Mar 15, 2020
 #1
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3 / [1 +3 +4] x 480 = 180 kg of sand

 Mar 15, 2020
 #2
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And how exactly did you get that answer?

TheGreatestOofman  Mar 15, 2020
 #3
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Um... You should add up 1, 3 and 4 (that equals 8) and divide 480 (kg) by the sum, which is 60, then look for context clues and realize that in the ratio, there is 3 sand so you evaluate the product of 60 and 3, which is 180 kg.

 

Also, good job, Guest! laugh

TheGreatestOofman  Mar 15, 2020
edited by TheGreatestOofman  Mar 15, 2020

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