Grade 5 - What was the number?

Ben is thinking of a number. He adds 5 to his number, then multiplies by 2. His answer is 20. What number is Ben thinking of?

Sarah is thinking of a number. She subtracts 4 from her number, then multiplies by 3. Her answer is 18. What number is Sarah thinking of?

Liam is thinking of a number. He multiplies his number by 4, then adds 3. His answer is 23. What number is Liam thinking of?

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