Question
If 
Find n and r.
Solution
2n = 3n - 3r
n - 3r = 0 ...(i)Also,
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9n + 9 = 13n - 13r + 13
4n - 13r = -4 ...(ii)Multiplying (i) by 4, we get
4n - 12r = 0 ...(iii)
Subtracting (iii) from (ii), we get -r = -4
r = 4From (i), n - 12 = 0
n = 12Hence, n = 12, r = 4.
