Question

Ben bowled 156 and 203 in his first two games. What must he bowl in his third game to have an average of at least 170​?

Answer 1

$\frac{156 + 203 + x}{3} \geqslant 170 \\ 156 + 203 + x \geqslant 510 \\ 359 + x \geqslant 510 \\ x \geqslant 151$