Question

If 7a=3b=10 , then 84ab=?​

Answer 1

Answer:

400

Step-by-step explanation:

$7a = 3b = 10 \\ Therefore, \\ 7a = 10 \: \: and \: \: 3b = 10 \\ a \: = \frac{10}{7} \: \: and \: \: b \: = \frac{10}{3} \\ Therefore \\ 84ab \: = \: 84 \times \frac{10}{7} \times \frac{10}{3} \\ = 84 \times \frac{100}{21} \\ = \frac{84}{21} \times 100 \\ = 4 \times 100 \\ = 400$

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