Question 1076106
Three numbers: a, b, c
write an equation for each statement
"The sum of three numbers is 145."
a + b + c = 145
 The third number is 4 times more the second number.
c = 4b
 The first number is 7 more than the second. 
a = b + 7
:
In the first equation, replace a with (b+7); replace c with 4b
(b+7) + b + 4b = 145
6b = 145 - 7
6b = 138
b = 138/6
b = 23
then
a = 23 + 7
a = 30
and
c = 4(23)
c = 92
;
;
Check this
30 + 23 + 92 = 145