Average of first three numbers is twice the fourth number. If the average of all the four numbers is 28. Find the fourth number?
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let the first number be X.
let the second number be y.
let the third number be z.
let the fourth number be w.
(x+y+z)/3= 2w
(x+y+z+w)/4= 28
x+y+z+w= 28*4
x+y+z+w= 112
x+y+z=112- w
(x+y+z)/3=2w
(112-w)/3=2w
112-w=3*2w
112- w=6w
112= 6w+ w
112= 7w
112/7=w
w=16
Answer = 16
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