What number should replace both the question marks (?) in the following question ?

?/144= 49 /?

What should come in the place of question mark (?) in the number series given below?

25, 34, 52, 79, 115,?

 A shopkeeper purchased 200 bulbs for Rs. 10 each. However, 5 bulbs were fused and had to be thrown away. The remaining were sold at Rs.12 each. What will be the percentage profit?

Four-fifth of a number is 10 more than two-third of the same number. What is the number?

In a fraction, twice the numerator is two more than the denominator. If 3 is added to the numerator and the denominator each, then the resultant fraction will be 2/3 .What was the original fraction ?

The sum of the digits of a two digit number is 12. If the new number formed by reversing the digits is greater than the original number by 54, then what will be the original number?