A cistern can be filled by two pipes in 30 and 40 min respectively. Both the pipes are opened at once, When the first pipe be turned off so that the tank may be just filled in 18 min?A. 12.5 minB. 13.5 minC. 14.5 minD. 16.5 min

In the figure (not to scale) AB = CD, angle DAP = angle DPA and A,B,C,D are concycli. If angle ADC = 80°, then find angle ACD.

Solve : 2^(x+2)+2^(x-1)=9

Volume of a Cylinder

What length of tarpaulin 3m wide will be required to make conical tent of height 8m and base radius 6m ? Assume that the extra length of material that will be required for stitching and wastage in cutting is approximately 20cm ( Use pi= 3.14)

Find the square of: 2a +b