Question

if 2∆3=8.5 , 9∆4=42.5 ,6∆8=55 , then7∆8 is equal to?

Answer 1

The pattern is:

2 ◇ 3 = 2 × 3 + ( 2+ 3 ) ÷ 2 = 8.5

9 ◇ 4 = 9 × 4 + (9 + 4 ) ÷ 2 = 42.5

So, 7 ◇ 8 = 7 × 8 + (7 + 8) ÷ 2 = 63.5