In an examination, 45% of all the students who appeared are boys and the rest are girls. If 60% of the boys and 70% of the girls passed, then what is the percentage of students who failed?

The value of 4÷12 of [3÷4 of {(4-2) x 6÷2}] -2x6÷8+3 is:

$$ {4\over 7}×{2{4\over 5}} ÷{2\over 5}=?$$

The LCM of two numbers is 1920 and their HCF is 16. If one of the numbers is 128, find the other number.

In the given question, two equations numbered l and II are given. Solve both the equations and mark the appropriate answer.

I. x² - 19x + 60 = 0

II. y²- 20y + 99 = 0

The difference between a number and the square root of the number is 2. The number is:

If $${8+2\sqrt{3} \over 3\sqrt{3}+5}=a\sqrt{3}-b$$, then the value of a+b is equal to:

By selling an article at 3/4th of the marked price, there is a gain of 25%. The ratio of the marked price and the cost price is-