Math Puzzles

see how many you can solve correctly

The Delivery Man (difficult)



Tell student to choose any number.

Add 5

Multiply result by 3

Subtract 9

Divide by 3

Subtract the number that was first selected



Result will always be 2(((n+5)3-9)/3)-n(3n+15-9)/3-n(3n+6)/3-nn+2-n2







Choose any number and add 9 to it.

Multiply this number by 2.

Subtract 4.

Divide the result by 2

Subtract the first number chosen.


(The result will always be 7)((((n+9)*2)-4)/2)-n(2n+18-4)/2-nn+7 -n = 7