Tanvi can do a work in 25 days, and Tai can complete the same work in 30 days. They started the work together for 5 days. How much work is left?

Correct option is B

Given:
Time taken by Tanvi to finish a job working alone is 25 days.
Time taken by Tai to finish the job is 30 days.
Formula Used:
Let total work be 1.
Then work done in each day will be $$\frac{\text{Total Work}}{\text{Total Time}}$$​​
Solution:
Work done by Tanvi in each day =$$\frac 1{25}$$​​
Work done by Tai in each day = $$\frac 1{30}$$​
Work done by Tanvi and Tai in each day  = $$\frac{1}{25} + \frac{1}{30} = \frac{6 + 5}{150} = \frac{11}{150}$$​​
Work done by Tanvi and Tai in 5 days = $$\frac{11}{150} \times 5 =\frac{11}{30}$$​​
Work left = $$1- \frac{11}{30} =\frac{19}{30}$$ ​