7. If a, b, c are in proportion. Find 'a'if b= 15 and c = 40.
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Answer:
A= 15 I think the answer of this question
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Step-by-step explanation:
If a, b and c are in proportion, then
a,b,b,c are in proportion.
This means that a:b = b:c
b = 15 and c = 40 , a = ?
Now,
Product of the extremes = Product of the means
So,
a × c = b × b
a × 40 = 15 × 15
a × 40 = 225
a = 225/40
\textbf{a = 5.625}a = 5.625
Hope it helps☺
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