Question

Find the value of (3a+5b)/(3b-5a) if a=5 and b=7

Answer 1

Answer:

If a:b=5:7, find (3a+5b):(5a-2b)

[A]50:9

[B]40:9

[C]50:11

[D]40:11

50:11

\because \frac{a}{b}=\frac{5}{7}

\therefore \frac{\left ( 3a+5b \right )}{5a-2b}=\frac{3\left ( \frac{a}{b} \right )+5}{5\left ( \frac{a}{b} \right )-2}

=>\frac{3\times \frac{5}{7}+5}{5\times \frac{5}{7}-2}=\frac{50}{11}

=>a:b=50:11

Hence option [C] is the right answer.

Answer 2

Step-by-step explanation:

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