Question

27. Uma works in bank. She sits at cash counter. When there are too many coins, she does
not count them. She weighs them. The weight of 1 ten rupees coin is 9 gm. Now find
how
many
10
rupee coins are there in a sack of if it weigh:
a) 180000g b) 81000g
c) 6300g d) 3600g​

Answer 1

Answer:

a) 20,000  b) 9,000  c) 700  d)  400

Step-by-step explanation:

If each coin weighs 9 grams, then we only need to divide the weights by 9 to get the answers.  

an easy way to do this is to ignore the zeros for the moment and divide the numbers at the end by 9.  

Thus 180,000 becomes 18, which you then divide by 9 to get 2, then add the zeros on the end.  

This should always work given that all the coins weigh 9 grams.  

One last thing Uma should be aware of though is the weight of the sack, it shouldn't be much but I would weigh it empty just to be sure, then subtract that weight from the gross weight before dividing.