Question

John worked out the problem below but got the wrong answer:

X + 18 < 22
X + 18 + 18 < 22 + 18
X<40
Explain his mistake and correct the problem for him.
Your answer:

Answer 1

Explanation:

He added 18 on both sides instead of subtracting 18 on both sides

X+18-18<22-18

X<4