Question

if 5*7=11, 7*9=31, 3*2=5, find value of 7*8​

Answer 1

Answer:

if 5*7=11, 7*9=31, 3*2=5, find value of 7*8

Step-by-step explanation:

if 5*7=11, 7*9=31, 3*2=5, find value of 7*8

if 5*7=11, 7*9=31, 3*2=5, find value of 7*8

if 5*7=11, 7*9=31, 3*2=5, find value of 7*8

if 5*7=11, 7*9=31, 3*2=5, find value of 7*8

Answer 2

Given:

             $5*7=11\\ 7*9=31\\ 3*2=5$

To Find:

             The value of $7*8$

Solution:

Since the logic behind $5*7=11$ and $7*9=31$ is,

half of the first digit$5+7 = 12\\12~<->~21\\~~2 = 11$

Similar with the $7*9=31$

So, by the above logic, the value of 7*8 is,

                                $7+8 =15\\15~<->~51$

half of the first digit  $2=21$

So, the value of 7*8 is 21.