If

2 3 = 9 5 4 = 26 6 2 = 13

Then

7 4 = ??

Answer is 15.

Solution:

2x3 = 6+3 = 9 5x4 = 20+6 = 26 6-2 = 4+9 = 13 7-4 = 3+12 = 15

2x3 = 6+3 = 9

5x4 = 20+6 = 26

6-2 = 4+9 = 13

7-4 = 3+12 = 15

If we give values of x=0,1,2 corresponding to y=9,26,13 the series follows the curve y=9+32x-15x^2. In that case for the next value of x=3, y comes =30

If 5+3+2 = 151022 9+2+4 = 183652 8+6+3 = 482466 5+4+5 = 202541 THEN 7+2+5 = ?

If 1,4,3=13; 4,5,4=9; 5,6,5=11 and 7,7,6=7 then 9,8,7=?