Four bells ring at the intervals of 5, 6, 8 and 9 seconds. All the bells ring simultaneously at some time. They will again ring simultaneously after: 

In two successive year 100 and 75 students of school appeared at the final examination. Respectively 75% and 60 % of them passed. The average rate of pass is:

Direction : What should come in place of the question (?) in the following question.

(41) ² + (38)² × (0.15)²=?

A person invested a sum of Rs. 18,600 at x% per year and another sum that is twice the former at (x+2)% per year, both at simple interest. If the total interest earned on both investments for $$ {3{1\over 2}}$$ years is Rs.23,110.50, then the rate of  interest per year on the second investment is:

If an 8-digit number 1862383A is divisible by 22, find the value of A.

If the radius and height of a cylinder increase by 20% and15% respectively. Then what is the % change in curved surface area? 

Ram bought a bike at 20% discount on MRP. After 1 year Ram sell the bike to Ramesh at 10% loss. After 1 year more Ramesh sell the bike at 20% profit to Ranjan. If Ranjan paid Rs. 1,29,600, then find the M.R.P. of the bike? 

Find the value of ∠BAC in the given diagram If AB=AC=CD and ∠ADB=20°?