Evaluate: $${-(4-6)^2-3(-2)+।-6।\over 18-9÷3×5}$$

A certain number of men can complete a work in 17 days working 8 hour a day. If the number of people is decreased to 60%. Then, find in how many hrs in a day should the remaining people work to complete the work in 51/2 days?

A straight line parallel to the base QR of the ∆PQR intersect PQ and PR at the points S and T respectively. If the area of the ∆PQT be 36 cm² then area of the ∆PRS is:

If x is real then the minimum value of (x²-x-1) is :

The equivalent single discount for two successive discounts of 15% and 10% is

The sum of money that will yield Rs. 60 as simple interest at the rate of 6% per annum in 5 years is-

A vendor sells potatoes at a cost price, but he mixes some rotten potatoes and thereby gains 25%. The percentage of rotten potatoes in the mixture is? 

Giving two successive discount of 25 % at a article is equal to giving one discount of ___%.