Jenny finished 12 of the 20 lessons in her piano book. Liam has finished the same percent from his piano book. His book contains 30 lessons. How many lessons has Liam finished?

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We are given that Jenny finished 12 of 20 piano lessons from her book and that Liam finished the same percentage from his book of 30 lessons. We are asked to find the number of lessons Liam finished.

We can set up a proportion. We set the ratio of Jenny's finished lessons to her total lessons equal to the ratio of Liam's finished lessons to his total lessons, letting x represent the number of his...

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