What number should replace the question mark?
42 - - - 170 93 - - - 840 18 - - - 26 54 - - - 274 67 - - - ??
42x4+2=170 93x9+3=840 18x1+8=26 54x5+4=274 67x6+7=409
Answer: 409
Logic
ab --- a*a*10+(a+1)*b 42 - - - 170 (4*4*10+5*2) 93 - - - 840 (9*9*10+10*3) 18 - - - 26 (1*1*10+2*8) 54 - - - 274 (5*5*10+6*4) 67 - - - 409 (6*6*10+7*7)
409 multiply 67 by 6 and add 7
35 - - - 16
67 - - - 26
19 - - - 20
61 - - - 14
95 - - - ?
143 - - - 22
26 - - - 4
104 - - - 16
65 - - - ?
51 - - - 306
17 - - - 136
45 - - - 405
26 - - - 208
38 - - - ?
12 - - - 25
5 - - - 11
21 - - - 43
18 - - - 37
2 - - - ?
