If 2x + 3y = 87 and 3x – 3y = 48, what is the value of x?

Thirty-five percent of 740 is 34 more than a number. What is two-fifths of the number?

A sum of money becomes triple itself in 16 years. In how many years will it become 5 times at the same rate?

Rahul, Shyam and Rohan invested capital in the ratio of 2:3:4 for the time period of 6:4:3. Find the ratio of profit distributed?

Two cones have their heights in the ratio 1:3 and the radii of their bases in the ratio 3:1. Find the ratio of their volumes?

The difference between 90% of a number and 83% of the same number is 175. What is 99% of that number?

In a class of 66 students there are 33 girls. The average weight of these girls is 61 Kg and average weight of the full class is 66 kgs. What is the average weight of the boys of the class?

If cos3A = X, then value of X?