Question 472729
a-Henry's age
b-Daisy's age

From information you have you can write 2 equations
1/2a+1/3b=11
(a+6)+(b+6)=40
Solve it as system of 2 equations
from second equation find a
a=40-12-b 
a= 28-b
 put it in first equation and find b
1/2(28-b)+1/3b=11
14-1/2b+1/3b=11
-3/6b+2/6b=-3
-1/6b=-3
b=18 then a= 28-18=10