John throws 150 coins onto a table. 60 of them show „head“, the others show „tail“. He wants the same amountof coins to show „head“ as „tail“. How many coins that show „head“ does he have to turn over?(A) 10 (B) 15 (C) 20 (D) 25 (E) 30

John saved 20c and 50c coins. When he reached 100 coins the amount totalled $40.40.What percentage of the coins were 50 cent coins?

I have 45 coins in my pocket. They are all either nickels or quarters. Thevalue of the coins is $5.65. How many of each coin do I have?

Three coins were tossed simultaneously. Each time the number of heads occurs is noted in the given data. Find the number of times only tails occurred.

A man has 25 paise, 50 paise and 1 Rupee coins. There are 220 coins in all and the total amount is 160. If there are thrice as many 1 Rupee coins as there are 25 paise coins, then what is the number of 50 paise coins?

Two unfair coins are tossed with the probability of a tail equal to 0.25. Calculate the probability ofgetting:(a) No heads.(b) Exactly one head.(c) At least one head.