Question

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

Answer 1

Answer:

Liam has finished 18 lessons

Step-by-step explanation:

Let

x -----> the number of lessons finished by Liam

we know that

If Liam has finished the same percent of lessons from his piano book than Jenny

then

the finished lesson and the number of lessons are proportional

Using proportion

$\frac{12}{20}=\frac{x}{30}\\\\x=12*30/20\\ \\x=18\ finished\ lessons$