Posted by **Carolyn** on Wednesday, April 25, 2012 at 12:12am.

Andrew has 7 20c coins and 5 50c coins in his piggy bank. What is the smallest number of coins he might have to shake out to be certain of having 2 50c coins?

- maths -
**PsyDAG**, Wednesday, April 25, 2012 at 10:48am
I don't know what country you are in, but I am not aware of "20c coins."

To be4 absolutely certain of getting 2 50c coins, you would have to shake out 9 coins. This is assuming the worst scenario that all the 20c coins come out first.

## Answer this Question

## Related Questions

- MATHS - Please show the quickest way to do this question? Amanda has 20 coins in...
- MATHS - Could you please explain the quickest way to calculate these questions? ...
- 5th grade math - I need to use quarters, dimes, nickles and pennies to make the ...
- maths - A bag contained a number of 20cents, 50cents and $1 coins. 1/3 of the ...
- maths - Xuan Yun has a total of 24 coins in her piggy bank. Some of them are ...
- Math - Susan has some $2-coins and $5-coins. If there are 18 coins and the total...
- Maths - The ratio of the number of coins Azam had to the number of coins Eddie ...
- Math - suppose you have 2 dimes ad 3 quarters in a bag. You shake it so that 2 ...
- Maths - A bag contains 8 coins of £1, 7 coins of 50p, 4 coins of 25p and 3 coins...
- Algebra - Andy has 145 coins in his coin bank. THe number of 5-denomination ...

More Related Questions