Plz with these questions, need it quickly

Quickly it is.

1/2 of the sugar to bake the cake, 3/8 of it to make tarts, means we've used



so there's only



left.

That's the fraction left; the amount of sugar left is

 

I forgot Q16.

Let c be the capacity of the jug







Check:  I'll check the exact answer; I don't like approximations.