If cot2 θ + cot4 θ = 2, then the value of 2 sin4 θ + sin2 θ is:
An observer on the top of a tree finds the angle of depression of a car moving towards the tree to be 30 degrees. After 3 minutes, this angle becomes 60 degrees. After how much more time will the car reach the tree?
A is thrice as efficient as B. A takes 24 days less than B to complete a work. If they work together, in how many days, will the work be completed?
A reduction of 10% in the price of wheat enables a man to buy 50 grams of wheat more for a rupee. How much wheat could originally, he had for a rupee?
The reduction of 15% in the price of salt enables a person to buy 2 kg more for ₹272. The reduced price of salt per kg (in ₹) is: