Elitmus Exam Category

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Elitmus Other Question
A and B can finish a work 30 days if they work together. They worked together for 20 days and then B left. A finished the remaining work in another 20 days. In how many days A alone can finish the work?

Options
1) 60
2) 50
3) 40
4) 30 p is a 3 digit no. and 1st digit is 3...and product of the digit is factor of that no..
how many no. are there who follow these ...n what is the sum of largest digit..satisfy above 3 condition