'6 c.c. of a 20% solution of alcohol in water is mixed with 4 c.c. of a 60% solution of

"6 c.c. of a 20%
solution of alcohol in water is mixed with 4 c.c. of a 60% solution of
alcohol in water. The alcoholic strength of the mixture is
`20 %`
b. `26 %`
c. `36 %`
d. `40 %`"

solution