Which number shoud replace the question mark in a triangle?

Question

Answer 1

Ans:28
Take 1st Triangle=(3*4*15)=180(divide by 10)=>18
Take 2nd Traingle=(1*20*6)=120(divide by 10)=>12
Take 3rd Traingle=(8*5*7)=280(divide by 10)=>28

Answer 2

Answer is 28.

1st) 4×3×15 = 180/10 = 18
2nd) 6×20×1= 120/10 = 12
3rd) 5×8×7 = 280/10 = 28