35+48=40 3+5+4+8=20 20+20=40

23+34=24 2+3+3+4=12 12+12=24

15+25=26 1+5+2+5=13 13+13=26

11+21= 1+1+2+1=5 5+5=10

Ans is 10

35 + 48 = 40 or (3+5+4+8) x 2 = 40 23 + 34 = 24 or (2+3+3+4) x 2 = 24 15 + 25 = 26 0r (1+5+2+5) x 2 = 26 Then 11 + 21 = ?? (1+1+2+1) x 2 = 10 The answer is 10

If a/b = 21/34; b/c = 121/120; c/d = 17/77; e/f = 11/15 and d/e = 14/17 then what is the value of (abc/def)*2?