SOLUTION: Donald walked 7/8 of a mile. Same walked 3/5 of a mile. How many miles further did Donald walk than Sam?

Algebra ->  Proportions -> SOLUTION: Donald walked 7/8 of a mile. Same walked 3/5 of a mile. How many miles further did Donald walk than Sam?       Log On


   

Question 459250: Donald walked 7/8 of a mile. Same walked 3/5 of a mile. How many miles further did Donald walk than Sam?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Find the difference
+7%2F8+-+3%2F5+
Multiply the 1st fraction by 5%2F5 which is just 1
Multiply the 2nd fraction by +8%2F8+ which is also 1
+%285%2F5%29%2A%287%2F8%29+-+%288%2F8%29%2A%283%2F5%29+
+35%2F40+-+24%2F40+
+11%2F40+ miles
This is how much further D. walked than S.
You can check using decimals
+7%2F8+=+.875+
+3%2F5+=+.6+
+.875+-+.6+=+.275+
On my calculator:
+11%2F40+=+.275+
OK