Posted by Lynnese on Wednesday, April 8, 2009 at 5:57pm.
Bobby has only pennies, dimes, and quarters. One half of Bobby's coins are pennies. One fourth of his coins are quarters. Three of his coins are dimes. How many coins does Bobby have?
please help me figure this one out?

4th grade  Courtney, Wednesday, April 8, 2009 at 6:01pm
Bobby has 12 coins.
he has 3 dimes, 6 pennies, and 3 quarters

4th grademath  Lynnese, Wednesday, April 8, 2009 at 6:12pm
How did you get your answer? Please explain it to me?

4th grade  Courtney, Wednesday, April 8, 2009 at 6:19pm
i used the equation: 1/2x+1/4x+3=x
then add 1/2x and 1/4x: 3/4x+3=x
then subtract 3/4x on both sides:3=1/4x
then divide by 1/4x: 12=x
12 coins is the answer :)

4th grade  Reiny, Wednesday, April 8, 2009 at 6:20pm
1/2 + 1/4 = 3/4
so 3/4 of his coins must be made up of pennies and quarters.
so that means the remaining 1/4 must be dimes
But we know that he has 3 dimes
think this way: 1/4 of what number is 3 ?
or
3 divided by 1/4 is .... ?
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