Greg practiced playing his clarinet for 12 minutes. He has practiced 40% of the amount of time he needs to practice today. How m

Question

Ratling [72]

4 years ago

9

Greg practiced playing his clarinet for 12 minutes. He has practiced 40% of the amount of time he needs to practice today. How m

any more minutes does Greg need to practice today?

Mathematics

1 answer:

lyudmila [28] · Answer 1 · 2021-11-15T16:17:13+03:00

lyudmila [28]4 years ago

8 0

You set up a proportion so: 12/x and 40/100
Cross multiply so 12 times 100 = 1200
and 40 times x = 40x
1200 divided by 40 = 30 minutes total
You know that he already know he spent 12 minutes doing it so
30 - 12 = 18 more minutes