If three cubes of sides 3 cm, 4.5 m and 5 cm respectively are melted to form a big money, then find the side of the new cube.

In a lottery, there are 7 prizes and 21 blanks. If a lottery is drawn at random, then what is the probability of getting a prize?

A starts a business with ₹45,000. After 6 months Benters in his business with ₹80,000. After one year Cinvests ₹1,20,000. In what ratio the profit will be divided among A, B and C after two years?

Directions: Find the wrong number in the following number series:

141, 156, 147, 162, 153, 165, 159

If $$ ({x+y\over z})=2$$ , then what is the value of $$ [{ {y\over {y-z}}}] +[{ {x\over {x-z}}}]$$.

A batsman scores 98 run in the 17^th match of his career. His average runs per match increased by 2.5. What is his average before the 17^th match?

What is the height (in cm) of an equilateral triangle whose each side is 8 cm?

The average age of a man and his son is 55 years. The ratio of their ages is 7 : 4, respectively. What will be the ratio of their ages after 6 years?