Quantitative Aptitude - Arithmetic Ability Questions

Present ages of Rahul and his brother are in the ratio of 5 : 3. After 4 years ratio of ages of Rahul’s brother and his sister will be 5 : 6. If the present age of his sister is 26 years, then what will be the age (in years) of Rahul 3 years from now?

Twenty one times of a positive number is less than its square by 100. The value of the positive number is

The sum of all prime numbers between 18 and 32 is:

The mean of 14 observations is 11. One more observation is included and the new mean becomes 12. The 15th observation is

A table was sold at a profit of 10%. If its cost price was 5% less and it was sold for Rs. 7 more, the gain would have been 20%. Find the cost price of the table.

What is the slope of the line perpendicular to the line passing through the points (-5 , 1) and (-2 , 0)?

A rectangular playground ground of length 125 m and width 75 m, has a walking strip of width 3 m in the middle of the ground, along the longer side. What is the area of the ground without the walking strip?

What is the value of cos (90 – B) sin (C – A) + sin (90 + A) cos (B + C) – sin (90 – C) cos (A + B)?