125k views
16 votes
I think of a number i multiple it by 5 i then subtract 19 finally i double the result the final number is 22 what number did i think of​

User Frederickf
by
4.3k points

2 Answers

14 votes

Unknown value: X

(5X-19)*2=22

5X-19=22/2

5X-19=11

5X=30

X=6

User Nextzeus
by
4.6k points
11 votes

To solve this problem, you read the problem backwards and to the opposite of that function.

  • if it says double --> divide by 2 22 / 2 = 11
  • subtract by 19 --> add 19 11 + 19 =30
  • multiply by 5 --> divide 5 30 / 5 = 6

Thus the number that is thought of is 6

Hope that helps!

User Sergey Geron
by
4.1k points