Question

the product of two number is 28÷81 if one is -4÷15. what is the other mumber

Answer 1

let the numbers be x and -4/15
$x \times ( \frac{ - 4}{15} ) = \frac{28}{81} \\ x = - \frac{28 \times 15}{4 \times 81} \\ x = - \frac{420}{324} = - \frac{210}{162} = - \frac{105}{81} = - \frac{35}{27}$
please follow me