Question

Fifteen times the square of a non-zero number is equal to 20 times number.What is the number? Its not 4/3

Answer 1

The number is (2√3) / 3

To find the missing number, convert what it says in words to an equation:

`15 {x}^(2) = 20x`
Divide both sides by 15:

`{x}^(2) = (20)/(15) \\ \\ {x}^(2) = (4)/(3)`
Take the square root:

`x = \sqrt{ (4)/(3) } \\ \\ x = (2)/( √(3) ) \\ \\ x = (2 √(3) )/(3)`