Problema Solution
A concrete mixture is to be made which contains 34% sand by weight, and 621 kg of mixture containing 29% sand is already on hand. How many kilograms of sand must be added to this mixture to arrive at the required 34%?
Answer provided by our tutors
Let 'x' represent the kilograms of 100% sand.
x + 0.29*621 = 0.34*(x + 621)
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click here to see the equation solved for x
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x = 47.05 kg
47.05 kg of sand must be added to the mixture.