Badki can bake 45 cakes in 9 hours, Badki and Chutki together can bake 80 cakes in 10hours. How many cakes Chutki can bake in 40 hours?

Number of cakes baked by Badki per hour:
=
9
45
​
=5 cakes/hour
Number of cakes baked by Badki and Chutki together per hour:

=
10
80
​
=8 cakes/hour
Number of cakes baked by Chutki alone per hour:

=8−5=3 cakes/hour
Total cakes Chutki can bake in 40 hours:

=3×40=120 cakes