Question

Sonia and Riya decided to complete a piece of work together. Sonia is capable of doing 9 units of work per day, whereas Riya can finish the complete task alone in 18 days. If the total work amounts to 108 units, how many days will they take working together?

A 21/11
B 36/5
C 33/5
D 23/4
E None of these
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