What value should come in place of the question mark (?) in the following question?

52x14+145018=1998÷?

After a discount of 34% an article is sold for Rs. 3168. What is the marked price (in Rs) of the article?

If 3P/7 = 4Q/11, then what is the ratio of P and Q respectively?

The average of 17 results is 60. If the average of first 9 results is 57 and that of the last 9 results is 65, then what will be the value of 9th result?

For an article the profit is 170% of the cost price. If the cost price increases by 20% but the selling price remains same, then what is the new profit percentage?

32% of a number exceeds 17% of the same number by 120. What is the value of the number?

A boat goes 15 km upstream and 10 1/2 km down stream in 3 hrs 15 min. It goes 12 km upstream and 14 km downstream in 3 hrs. What is the speed of the boat in still water?

A person lent certain sum of money at 5% per annum simple interest and in 15 years the interest amounted to Rs 250 less than the sum lent. What was thesum lent (in Rs)?

If  x=2+32-3, then what is the value of x+1/x ?