**Solution:**

Let those friends were having Rs *x* and *y* with them.

Using the information given in the question, we obtain

*x* + 100 = 2(*y* − 100)

*x* + 100 = 2*y* − 200

*x* − 2*y* = −300 (*i*)

And, 6(*x* − 10) = (*y* + 10)

6*x* − 60 = *y* + 10

6*x* − *y* = 70 (*ii*)

Multiplying equation (*ii*) by 2, we obtain

12*x* − 2*y* = 140 (*iii*)

Subtracting equation (*i*) from equation (*iii*), we obtain

11*x* = 140 + 300

11*x* = 440

*x* = 40

Using this in equation (*i*), we obtain

40 − 2*y* = −300

40 + 300 = 2*y*

2*y* = 340

*y* = 170

**Therefore, those friends had Rs 40 and Rs 170 with them respectively.**