3. A piggy bank contains Rs. 1 coins, Rs. 2 coins, Rs. 5 coins and Rs. 10 coins. The number of Rs. 10
coins is four times the number of Rs. 5 coins, 8 times the number of Rs. 2 coins and 16 times the
number of Rs. 1 coins. If all the money in the piggy bank adds up to Rs. 555, find the number of
Rs. 10 coins in it.
(1 Point)
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Answer:
Probability of an event is defined as the ratio of favorable outcomes to the total outcomes.
(i) Probability that the fallen coin is Rs. 2 coin is the ratio of number of Rs. 2 coins and total number of coins.
P
2
=
100+25+15+10
25
=
6
1
(ii) Probability that the fallen coin is Rs. 5 coin is the ratio of number of Rs. 5 coins and total number of coins.
P
5
=
100+25+15+10
15
=
10
1
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