Bunuel wrote:
If a + 3b + 4c = 9 and a + 4b + 6c = 15, then what is the value of a + 2b + 2c?
A. 0
B. 3
C. 6
D. 9
E. 24
a+3b+4c=9 --(1)
a+4b+6c=15 --(2)
(2)-(1) ==>a+b+2c=6--(3)
(1)-(3) ==> a+2b+2c =3
Ans:B
If a + 3b + 4c = 9 and a + 4b + 6c = 15, then what is the value of a + 2b + 2c?
A. 0
B. 3
C. 6
D. 9
E. 24
a+3b+4c=9 --(1)
a+4b+6c=15 --(2)
(2)-(1) ==>a+b+2c=6--(3)
(1)-(3) ==> a+2b+2c =3
Ans:B
