Find: 20% of Rs 2500

Find the whole quantity if: 40% of it is 500km.

Find: 15% of 250

Find: 75% of 1kg

Find: 1% of 1 hour

Find: 20.1xx4

Find the whole quantity if: 5% of it is 600.

Find the whole quantity if: 12% of it is Rs1080.

Calculate the mole fraction of ethylene glycol (C_(2)H_(6)O_(2)) in a solution containing 20% of C_(2)H_(6)O_(2) by mass.

Of the students in a college, it is known that 60% reside in hostel and 40% are day scholars (not residing in hostel) . Previous years results report that 30% of all students who reside in hostel attain A grade and 20% of day scholrs attain A grade in their annual examination . At the end of the year, one student is chosen at random from the college and he has an A grade, what is the probability that the student is a hostler ?

A man repays a loan of Rs. 3250 by paying Rs. 20 in first month and then increase the payment by Rs. 15 every month .How long will it take to clear his loan ?