Question

1*5=33
2*10=118
3*15=225
4*20=?

Answer 1

1 x 5 = 33

2 x 10 = 118

3 x 15 = 225

118 - 33 = 85
225-118 = 107
107 - 85= 22
107 + 22 = 129
225+129 = 354

So, 4 x 20 = 354