If
3b + 7s + c = 120
4b + 10s + c = 164.5
what is the value of b+s+c ?
My textbook gives 31 as the answer, I cannot understand.
thank you for any help.
Hello, Simone!
There may be an elegant solution . . . but I can't find it.
What is the value of ?
My textbook gives 31 as the answer.
Subtract [1] from [2]: .
Substitute into [1]: .
Consider: .
Substitute [3] and [4]: .
. . . Therefore: .
Too fast for me, Jhevon!