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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]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
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