Try creating a proportion, take 12/21=x/15
you should have gotten x=8.571
P.S.: hope I helped
It’s A)5m+16 75 your welcome and if it’s wrong I don’t know why
No, the first choice equals 190 and the second 144.
Answer:
53.5
Step-by-step explanation:
c = the height of the first 3 boys.
c = 54 + 48.5 + 46
c = 148.5
Now you add a fourth boy. His height is h.
A(h)= (c + h)/d
d = the total number of boys which is 4.
The new average is 50.5
A = (c + h)/d
50.5 = (148.5 + h) / 4 Multiply both sides by 4
202 = 148.5 + h Now subtract 148.5 from both sides
202 - 148.5 = h
h = 53.5
