Quantitative Aptitude - Arithmetic Ability Questions

In ΔABC measure of angle B is 90 deg. If tanA = 15/8, and AB = 0.8 cm, then what is the length (in cm) of side AC?

What is the digit in unit's place of the product 51 x 52 x 53 ...... 59?

The sum of a non-zero number and thrice its reciprocal is 52/7. Find the number.

An article was sold for Rs. 2100 at a profit of 25%. What is its cost price?

What is the reflection of the point (-3, 1) in the line x = -2?

Average age of 5 students of a school is 14 years. The average age of students and their Mathematics and science teachers is 30 years. If the age of science teacher is 6 years more than the age of Mathematics teacher, then what is the age (in years) of Mathematics teacher?

Average marks obtained by 19 boys of a college is 56. If the highest marks and lowest marks obtained are removed, then the average reduces by 2. What is the average of the highest and lowest marks obtained?

If percentage of profit made,when an article is sold for Rs.78, is twice as when it is sold for Rs.69, the cost price of the article is