Question

Lois is 3 years older than Oscar. The sum of their ages is no more than 20. Write an inequality that can be used to represent this situation, where x represents Oscar’s age.

Answer 1

Answer:

let Oscar's years be x

• Oscar → x

• Lois → (x + 3)

${ \rm{x + (x + 3) \leqslant 20}} \\ \\ { \boxed{ \rm{2x + 3 \leqslant 20}} }$

Answer 2

• Let Oscar be x years old
• Lois is x+3 years old

ATQ

$\\ \sf\longmapsto x+x+3\leqslant 20$

$\\ \sf\longmapsto 2x+3\leqslant 20$

$\\ \sf\longmapsto 2x\leqslant=17$

$\\ \sf\longmapsto x\leqslant \dfrac{17}{2}$