Henry is mixing concrete. To make concrete he needs to mix cement sand and gravel in the ratio 4:3:1 by weight. Henry needs to m
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<em>Golden ratio, also known as the golden section, golden mean, or divine proportion, in mathematics, the irrational number (1 + Square root of√5)/2, often denoted by the Greek letter ϕ or τ, which is approximately equal to 1.618.</em>
