Kath starts with a number. she adds 3 to her number then double the result. finally, she subtracts 7. if she ended with 9, what number did she start with?

Question

Amelie Norton

Mathematics

24 January, 11:38

Kath starts with a number. she adds 3 to her number then double the result. finally, she subtracts 7. if she ended with 9, what number did she start with?

+5

Answers (1)

Know the Answer?

Stokes · Answer 1

The answer is 5. Work backwards: first add 7 to 9, then divide by 2, then subtract 3.

9+7=16

16/2=8

8-3=5

Cross Check:

5+3=8

8*2=16

16-7=9

Final Answer: 5