S can finish 50% of a work in a day. T can do 25% of the work in a day. Both of them together will finish the work in .... days.
"S can finish 50% of a work in a day" means S can complete work in $$\frac{1}{2}$$a day
"T can do 25% of the work in a day" means T can complete work in $$\frac{1}{4}$$ a day
both S and T can Complete the work in =$$\frac{1}{2}$$ +Â $$\frac{1}{4}$$ =Â $$\frac{3}{4}$$ a day
So they can complete the whole work in =Â $$\frac{4}{3}$$ days
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