Solve 18/5/frac{2{25}-5/16}

$$\frac{ \frac{ 18 }{ 5 } }{ \frac{ 2 }{ 25 } - \frac{ 5 }{ 16 } }$$

Evaluate

$$-\frac{480}{31}\approx -15.483870968$$

Solution Steps

Least common multiple of 25 and 16 is 400. Convert \frac{2}{25} and \frac{5}{16} to fractions with denominator 400.

$$\frac{\frac{18}{5}}{\frac{32}{400}-\frac{125}{400}}$$

Since \frac{32}{400} and \frac{125}{400} have the same denominator, subtract them by subtracting their numerators.

$$\frac{\frac{18}{5}}{\frac{32-125}{400}}$$

Subtract 125 from 32 to get -93.

$$\frac{\frac{18}{5}}{-\frac{93}{400}}$$

Divide \frac{18}{5} by -\frac{93}{400} by multiplying \frac{18}{5} by the reciprocal of -\frac{93}{400}.

$$\frac{18}{5}\left(-\frac{400}{93}\right)$$

Multiply \frac{18}{5} times -\frac{400}{93} by multiplying numerator times numerator and denominator times denominator.

$$\frac{18\left(-400\right)}{5\times 93}$$

Do the multiplications in the fraction \frac{18\left(-400\right)}{5\times 93}.

$$\frac{-7200}{465}$$

Reduce the fraction \frac{-7200}{465} to lowest terms by extracting and canceling out 15.

$$-\frac{480}{31}$$

Factor

$$-\frac{480}{31} = -15\frac{15}{31} = -15.483870967741936$$