math
posted by Anonymous on .
shawna had to decorate 3 gift packages with ribbon. she used 1 1/3 yards of ribbon for the first package, 1 1/2 yards of ribbon for the second package, and 1 2/3 yards to decorate the third package. shawna had 3 1/2 yards of ribbon left over. how much ribbon did she start with?

First find the common denominators and the equivalent fractions.
1 1/3 = 1 4/12
1 1/2 = 1 6/12
1 2/3 = 1 8/12
Add.
3 18/12 = 4 1/2
4 1/2 + 3 1/2 = ?