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madam [21]
3 years ago
8

Three of four numbers have a sum of 22. If the average of the four numbers is 8, what is the fourth number ?

Mathematics
1 answer:
KatRina [158]3 years ago
3 0
X+y+z=22

(x+y+z+t)/4=8
subsitute
x+y+z=22
(22+t)/4=8
multiplly by 4
22+t=32
subtract 22
t=10

the fourth number is 10
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