What value should come in place of the question mark (?) in the following question?

52x14+145018=1998÷?

If the simple interest on a sum of money for 2 years at 5% per annum is Rs. 50, the compound interest on the same at the same rate and for the same time is:­

If the length of the shadow of a vertical pole be √3 times the height of the pole, the angle of elevation of the sun is:­

∆ABC inscribed in a circle so that BC is a diameter. The tangent at a point C intersects BA when produced at a point D. If ∠ABC=36°then the value of ∠ADCis 

ΔABC is similar to ΔDEF. If the ratio of similar sides is K:1, the ratio of their areas is

If k is the largest possible real number such that p4+q4=(p2+kpq+q2)(p2-kpq+q2),then the value of k is

If a+b+c=15 and 1a+1b+1c=71abc, then the a3+b3+c3-3abc is

Eight members of a club donate Rs. 100 each towards a Relief Fund and the President of the club donates Rs. 50 more than the average donation of all (including President) of them. Then the contribution of the president is

When n is divided by 4, the remainder is 3. The remainder when 2n is divided by 4 is: