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Natalie Goodwin

Feb 20, 2025

If a varies directly as b, and a = 28 when b = 7, find b when a = 5?

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4 Answers

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Miss Alice Doyle

Feb 20, 2025

a = 28b = 7 a = 28 * (5/28) = 5b = 7 * (5/28) = 5/4... Show More
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Miss Alice Doyle

Feb 20, 2025

I’m guessing that varies directly should mean directly proportional to, so this is a ratio problem which should be set up as :28/ 7 = 5/b Cross multiply and divide to solve for b:(7×5)/28 = 1.25Therefore b = 1.25... Show More
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Miss Alice Doyle

Feb 20, 2025

28/7 = 5/xcross multiply:35 = 28xdivide each side by 28:35/28 = 28x/28x = 35/28**simplify**x = 5/4hope this helps(:... Show More
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