For the following questions answer them individually
20 women and 15 men together can complete a work in 6 days. It takes 150 days for a single woman to complete the work. In how many days can a single man complete the work?
A circle of radius 4 cm is drawn inscribed in a right angle triangle ABC, right angled at C. If AC= 12 cm, then the value of CB is:
Simplify the expression $$\frac{\sqrt{x} - \sqrt{y}}{\sqrt{x} + \sqrt{y}}$$, where x = 2 and y = 3.
Select the most appropriate option to fill in the blank.
Stories of dolphins’ saving human lives ________ throughout history.