Start with n, then you get;
Add 17: n + 17
Double it: 2n + 34
Subtract 4: 2n + 30
Double it: 4n + 60
Add 20: 4n + 80
Divide by 4: n + 20
Subtract 20: n
which is where you started.
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Any four-digit number will do. Add it to the number 33333, to get the original number you have to subtract from.Any four-digit number will do. Add it to the number 33333, to get the original number you have to subtract from.Any four-digit number will do. Add it to the number 33333, to get the original number you have to subtract from.Any four-digit number will do. Add it to the number 33333, to get the original number you have to subtract from.
Pick any number. Multiply by 6. Add 13. Subtract 7. Divide 3. Divide 2. Then subtract by the original number you chose. Your result will always be 1. Tell a friend to mentaly multiply their age by 2. Tell them to add 14 then divide 2. Ask your friend what number they currently have. Now, you mentally subtract 7 from the number they tell you, then you'll know your friend's age.
Whether the change is an increase or decrease . . . -- Divide the new number by the original number. -- Multiply the result by 100. -- Subtract 100. -- Now you have the percent of change.
Subtract 8,400 from 10,000 and you will get 1,600. Divide that in half (divide by 2) and you get 800. Add 800 to 8,400 (or subtract from 10,000 as a double check) and you get 9,200.
You get 50.