Question

Teacher tells the class that the highest score obtained by a student are 9 more than thrice the lowest score. If the highest score is 90. What is the lowest score?

Answer 1

Let the lowest score scored be $x$.
Then highest score in terms of $x=3x+9$.
Given, highest score $=90$

$3x+9=90$
$3x=90-9$
$3x=81$
$x=\frac{81}{3}=27$
Therefore,the lowest score obtained $=27$