Discussion of Question with ID = 001 under Averages

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Question

A box contains 5 marbles each having a weight of 156 grams. The box also contains 25 marbles each having a weight of 114 grams. What is the average weight of all the marbles in the box?

A

121 grams.

B

122 grams.

C

120 grams.

D

119 grams.

Soln.
Ans: a

The weighted average = ${5 × 156 + 25 × 114}/30$, which equals ${780 + 2850}/30$ = 121.

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