some equations are solved on the basis of the certain system.Find the correct answer for the unsolved equation on that basis.
5 x 4 x 3 = 70
6 x 5 x 4 = 140
7 x 6 x 5 = ?
210
220
230
240
D.
240
5 x 4 x 3 = 60 + 10 = 70
6 x 5 x 4 = 120 + 20 = 140
7 x 6 x 5 = 210 + 30 = 240