If you set up the equation 2/3x = 3/5, and solve for x you will get 9/10. In this equation, x is the number of groups. So, 2/3 times the number of groups, or x, is equal to 3/5. If you solve for x you get 0.9. Another, less confusing way to solve these types of equations is by dividng 3/5 by 2/3. If you divide 3/5 by 2/3, you will get how many groups of 2/3 are in 3/5.
