Question

Danny has 18 coins in a piggy bank; 4 quarters, 3 dimes, 5 nickels, and 6 pennies. she shakes the piggy bank and a coin falls out. what is the probability that the coin is not a penny?

Answer 1

So there are 18 coins in total right?(4 quarters+3dimes+5nickels+6 pennies)
So the number of pennies is 6
So probability of pennies (6) out of the whole coins(18) is 6/18 right?
This can be simplified to 2/6(since the highest common factor is 3 and dividing both by 3 gives you 2 and 6)
So probability of a pennie out of the piggy bank is 2/6