X over 15 = 10 over 20. Solve.

X/15=10/20

x/15=1/2

x=1/2 * 15

x=15/2

X/15=10/20

Multiply 15 on both sides

x=10/20*15

Convert 15 into an improper fraction

x=10/20*15/1

Multiply

Final Answer: x=150/20 or 7 10/20 or 7 5/10 or 7 1/2 or 7.5 * All answers are equivalent to each other.