The second number in the given number pairs is obtained by performing certain mathematical operation(s) on the first number. The same operation(s) are followed in all the number pairs, EXCEPT one. Find that odd number pair.

35 : 280

The logic followed here Is :

Ist number  × 6 = second number

40 : 240 - 40 × 6 = 240

25 : 150 - 25 × 6 = 150

35 : 280 - 35 × 6 = 210  ≠ 280

30 : 180 - 30 × 6 = 180