A boy added all natural numbers from 1 to 10, however, he added one number twice due to which the sum becomes 58. What is the number which he added twice? 

Natasha decided to spend 45% of her salary on shopping. On completion of her shopping, she realized that she had spent only Rs.11475, which was 60% of what she had decided to spent. How much is Natasha’s salary?

The average age of a cricket team of 11 players is the same as it was 3 years back because 3 of the players whose current average age of 33 years are replaced by 3 youngsters. The average age of the new comers is: 

The MRP of a watch is Rs.4750. The shop sells it at 12% discount. If the shopkeeper had purchased the watch for Rs. 3,850, what is his gain? 

If $$ sin θ ={20 \over 29}$$, then what is the value of sec θ sin θ?

By selling an article for Rs. 320, a man incurs a loss of 20%, what should be the selling price of an article to gain 30%?

A starts a business, after 6 months B also join him with Rs.4500 and after 2 months of B’s joining C also join them with Rs.4500. If A gets approx. Rs 4900 out of total annual profit of Rs. 10,000 then find the approximate value of initial investment of A.