he mean of four numbers is 30. If three of the numbers are 12, 50, and 48, what is the fourth number? A. 120 B. 10 C. 12 D. 30
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3
(12+50+48+x)/4=30
12+50+48+x=120
110+x=120
x=120-110
x=10
12+50+48+x=120
110+x=120
x=120-110
x=10
Answered by
1
30 = 12+50+48+a÷4
30×4= 110+a
120=110+a
a=120-110
a =10
30×4= 110+a
120=110+a
a=120-110
a =10
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