+0  
 
0
57
1
avatar

it's middle skool stuff so prolly everyone gets them cuz... ppl here are SMARTTTTTTTTTTTTTTTT someone plz help :( i also need step by step explanation!! thanksss

 

 Aug 16, 2020
 #1
avatar+26856 
+1

Let the number be   xy        this is the same as  10x  +   y        you are given x+ y = 15      from this you can see that   y = 15-x

You are also given   yx = 30 + 6x    or    10y + x = 30 + 6x    sub in the red definition of y into this equation to get:

                                                                10(15-x)  + x = 30 + 6x

                                                                 150 - 10x  + x = 30 + 6x

                                                                   120 = 15x

                                                                     x = 8                      since  x+y = 15      then  y = 7

 

Original number is then   xy         87

   reversed number is    78    which   is equal to  30 + 6(8)

 Aug 16, 2020

14 Online Users

avatar
avatar
avatar