+0  
 
0
49
1
avatar+113 

Mrs Koh baked 68 cookies on Monday. She baked 3/8 of the remaining cookies on Tuesday and the rest of the cookies on Wednesday. If she baked 65 cookies on Wednesday, how many cookies did she bake in the 3 days altogether?

 Jun 7, 2022
edited by Guest  Jun 7, 2022
 #1
avatar+124525 
+1

Cal N the total number baked

 

Monday she baked  68

Tuesday she baked (3/8)(N - 68)

Wed she baked  65

 

So

 

68  + (3/8)(N -68) + 65 = N

 

133 + (3/8)N  -  (3/8)(68)  = N            rearrange as

 

133  - 25.5   =  (5/8)N         

 

107.5 = (5/8)N

 

N =  107.5 ( 8/5)   =     172

 

 

 

cool cool cool

 Jun 7, 2022

17 Online Users

avatar