31) The average weight of 40 coins is 7 gm. If the weight of the bag be included the average weight increase by. 0.07 gm. What is the weight of the bag? (a) 3.87 gm (b) 5.87 gm (c) 9.87 gm (d) 7.87 gm
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Step-by-step explanation:
Sum of 40 Coins = 7*40 = 280
Bag weight added, which is Xgm
280+x/41 = 7+0.07
x= 289.87-280 = 9.87gm
OA :: D
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