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avatar+420 

I'm thinking of a number

then I multiply it by 3

then I add 4

then divide the answer by 4

my final answer is 3 less than the number I thought of in the beginning

what is the number I'm thinking of

 Apr 12, 2018
 #1
avatar+429 
+2

16

 

smileysmileysmiley

 Apr 12, 2018
 #2
avatar+557 
+2

? * 3 + 4 ÷ 4 = ? - 3

16 * 3 + 4 ÷ 4 

48 + 4 ÷ 4 

52 ÷ 4 

13

13 3 less than 16

 

 

winkwinkwink

 Apr 12, 2018
 #3
avatar+100587 
+2

Let N be the number

 

( [ N * 3]  + 4 )  / 4  =   N - 3

 

(3N + 4 ) / 4  =  N  - 3       multiply both sides by 4

 

3N + 4  =  4 (N - 3)

 

3N + 4   =  4N - 12       add 12 to both sides, subtract 3N from both sides

 

16  =  N

 

So

 

16  - 3   =   13

 

 

cool cool cool

 Apr 12, 2018

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