If selling price of 10 articles is same as the cost price of 12 articles. Find the gain / loss%.
Correct!
Wrong!

What is the remainder when $11^{37}$ is divided by 13
Correct!
Wrong!

A, B and C take 15, 10 and 6 days respectively to complete a piece of work. If A, B and C start the work together and then A and C leave after 2 and 3 days respectively. Find the total number of days in which the work was completed
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