In an examination, 65% of the students passed in Mathematics, 48% passed in Physics and 30% passed in both. How much percent of students failed in both the subjects ?

At an election there were two candidate got 38% of votes and lost by 7200 votes. The total numbers of valid votes were :

In 2 kg mixture of copper and aluminium, 30% is copper. How much aluminium powder should be added to the mixture so that the quantity of copper becomes 20% ?

If 20% of (A + B) = 50% of B, then value of $$\frac{2A - B}{2A + B}$$   is :

Ticket for all but 100 seats in a 10000 seat stadium were sold. Of the ticket sold, 20% were sold at half price and the remaining tickets were sold at the full price of Rs. 20. The total revenue from the ticket sales, (in Rs.) was :

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