Question 1067674
2G+3C=40
12G+2C=32
-12G-18C=-240, multiplying the top by -6 to eliminate G.  Add it to the equation above it.
-16C=-208
C=13 R
substitute in the first
2G+39=40
2G=1
G=0.5
Check in second
12(0.5)+2(13)=32, which it does
The Globes are R0.5
The Cement is R13