If D and E are the mid-points of the side AB and AC respectively of the ∆ABC in the figure given here, the shaded region of the triangle is what percent of the whole triangular region?

A rectangular ground 16m long and 10m breadth. It has a gravel path 2.5m wide all around it on the outside. What is the area of the path?

Present ages of father and the son are in the ratio of 6 :1 respectively. 4 year hence the ratio of their ages will become 4:1 respectively. What is the son's present age ? 

What is the measure of the circum radius of a triangle whose sides are 9cm, 40cm and 41cm?

Interest earned by Ramesh on Rs.10,000 for 2 years at R% p.a. simple interest is how much more/less than interest earned by him on Rs. 8000 for 2 years at (R+10)% p.a. compounding annually. If Rs. 2000 is invested at 2R% p.a. simple interest for a year, then it would fetch an interest of Rs.400.

The price of a shirt after 15% discount, is Rs.119. What was the marked price of the shirt before discount?

M, P and Q together started a business. M invested ₹ 6, 500 for 6 months, P invested ₹ 8,400 for 5 months and Q invested ₹ 10,000 for 3 months. M is working member for which he gets 5 % of total profit extra. If the total gain is  7,400 , then Q's share is : 

The angle of elevation of sun changes form 30°to 45°, the length of the shadow of a pole decreases by 4 meters, the height of the pole is (Assume √3 = 1.732)