Average weight of 8 gold coins is 20 g per coin. Average weight of 12 silver coins is 35 g per coin. What is the average weight per coin for 20 coins?
Given avg weight of 8 gold coins is 20
sum of 8 coins=8$$\times\ $$20=160
Also given that avg weight of 12 gold coins is 35
so,sum of 12 coins=420
now we need to find avg weight of 20 gold coins
=$$\frac{\left(160+420\right)}{20}$$
=$$\frac{580}{20}$$
=29
hence answer is option b
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