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my7butterflies
20.06.2020 •
Mathematics
The average of four numbers is 38, and the average of the first two numbers is 42, and the average of the last three numbers is 36. What is the second number?
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Ответ:
40
Step-by-step explanation:
let the numbers be a+b+c+d.
the average of 4 numbers is 38
; (a+b+c+d)/4 = 38
(a+b+c+d) = 152 equ1
the average of the first two numbers is 42
; (a+b)/2 = 42
(a+b) = 84 equ2
the average of the last three numbers is 36
; (b+c+d)/3 = 36
(b+c+d) = 108 equ3
substitute equ3 into equ1
a + 108 = 152
a= 152 - 108
a = 44
input the value of a into equ2
44 + b = 84
b = 40
the second number is 40.
I hope this helps.
Ответ:
78x4
Step-by-step explanation: