Quantitative Aptitude - Arithmetic Ability Questions

If p and q are the roots of the equation x2 –15x + r = 0 and p –q = 1, then what is the value of r ?

What is the value of sin225°+ sin265°?

A student multiplied a number by 4/7 instead of 7/4. What is the percentage error in the calculation?

P and Q can do a project in 150 and 100 days respectively. In how many days can they complete 60% of the project if they work together?

In a class of 50 students there are 22 girls who scored an average of 35 marks in the test. What is the average marks of the boys if the class average is 42 marks?

After deducting 60% from a certain number and then deducting 15% from the remainder, 1428 is left. What was the initial number?

2 sec2A is equal to

Rithika had Rs 8000. She invested some of it in savings scheme P and the rest of the money in savings scheme Q. She invested for 3 years in savings scheme P and for 2 years in savings scheme Q. savings scheme P offers SI at a rate of 20% pa while savings scheme Q compounded annually at the rate of 30% pa. The interest received from savings scheme P is 930 more than the interest received from savings scheme Q. If Rs 1500 is debited from the invested amount of savings scheme P then find the difference between the amount invested by Rithika in savings scheme P & savings scheme Q.