Question

Jenny has finished 15 of the 20 lessons in her piano book. Liam has finished the same percent of lessons from his piano book. His book contains 40 lessons. How many lessons did Liam finish?

A) 30 lessons
B) 25 lessons
C) 20 lessons
D) 35 lessons

Answer 1

Jenny finished 15 out of 20 lessons in her piano book. Liam's book contains 40 lessons. Liam finished the same percent of lessons as Jenny, which is 75%. Therefore, Liam finished 30 lessons.

Step-by-step explanation:

To find out how many lessons Liam finished, we need to determine the percentage of lessons that Jenny finished first. Jenny finished 15 out of 20 lessons, which is equivalent to 15/20 = 0.75 or 75%.

Since Liam finished the same percent of lessons as Jenny, we can use this percentage to find out how many lessons he completed. Liam's book contains 40 lessons, so 75% of 40 is (75/100) × 40 = 0.75 × 40 = 30 lessons.

Therefore, Liam finished 30 lessons from his piano book. The correct answer is option A) 30 lessons.