Question

How quick can you solve this using these number? 1, 2, 2, 4, 6, 7,7,8,9 = 2 Х + + - + = 5 - + + + - =13 7 15 15​

Answer 1

Answer:

Given : numbers 1,2,2,4,6,7,7,8,9

To find : Combinations of numbers satisfying all these

Solution:

Starting from Let most bottom

it can be 6 , 7 , 8 , 9  or as sum of 1st two > 13  

6  & 8 are not possible as  then product of 1st two in 1st column required will be 13 or 15  which is not possible

Hence it can be 7 or  9

if 7  then   1st column must be 2 , 7

so no more 7 left

hence bottom row    will have  8 & 2      

This way  we will conclude

(_7__) + (_1__) ÷ (_4__) = 2

x              +          +

(_2__) -  (_ 6__) + (_9__) = 5

-              +         +

(_7__) + (_8__) -  (_2__) = 13

=              =             =

7             15            15