Question

Product of two numbers is $18.75$. If one number is three times the other, then find larger number.

Answer 1

$\begin{array}{c}1stnumber=x\\ 2ndnumber=3x\\ x\times 3x=18.75\\ \Rightarrow 3x^2=18.75\\ \Rightarrow x^2=\frac{18.75}{3}=6.25\\ \Rightarrow x=\pm 2.5\\ lerno.\\ \Rightarrow 3\times \pm 2.5\\ \Rightarrow \pm 7.5\\ -7.5or7.5\end{array}$