math
posted by bob on .
Help!
These are fractions, so bear with me:
5/8 x= 9/10
Solve with the multiplicaation principle. How do I do this? The fractions throw me off every time!!!

I interpret "multiplicaation principle" to mean multiply both sides by the same multiplier,
I will choose 8/5 (do you see why?)
(8/5)(5/8)x = (8/5)(9/10)
x = 72/50
I just crossmultiply to get
50x = 72
x = 72/50