Quantitative Aptitude - Arithmetic Ability Questions

The average age of a class of 39 students is 15 years. If the age of the teacher is included, then the average increases by 3 months. Find the age of the teacher.

If two flood gates A and B function simultaneously, the reservoir will be filled iu 6 hours. Gate A fills the reservoir 5 hours faster than gate B. How many hours does the faster flood gate take to fill the reservoir?

What is the measure of the central angle of the sector whose area is 462 sq cm and radius of the circle is 21 cm?

A box of sweets was distributed between A and B in the ratio 3 :4. If A got 36 sweets , what was the total no.of sweets

If 2x/3 - [5(4x/5 - 4/3)]/2 = 1/3, then what is the value of x?

If the selling price is doubled, the profit triples. The profit percent is

A fan was sold for Rs. 3600 at a loss of 4%. What would be the gain or loss percent ifit was sold for Rs. 4200?

The average of 100 items was found to be 30 . If at the time of calculation , two items were wrongly taken as 32 and 12 instead of 23 and 11 , then the correct average is