A number is divisible by 9 if the sum of its digits is greater than or equal to 9. 621 (6+2+1=9), for instance, is divisible by 9. Simply move the decimal point one place to the left to find the 10% ...

Simplification Questions: Simplification is the highest-scoring area in the Quantitative Aptitude section of competitive exams. It judges a test-taker's ability to perform basic maths calculations.