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from KENDRIYA VIDYALAYA, asked a question
Subject: Math , asked on 4/7/12

if HCF of 210 and 55 is expressed in the form 210 x 5 + 55y. find y?

Let us first find the HCF of 210 and 55.

Applying Euclid division lemna on 210 and 55, we get

210 = 55 Ă— 3 + 45  ....(1)

Since the remainder 45 â‰  0. So, again applying the Euclid division lemna on 55 and 45, we get

55 =  45 Ă— 1 + 10  .... (2)

Again, considering the divisor 45 and remainder 10 and applying division lemna, we get

45 = 4 Ă— 10 + 5  .... (3)

We now, consider the divisor 10 and remainder 5 and applying division lemna to get

10 = 5 Ă— 2 + 0  .... (4)

We observe that the remainder at this stage is zero. So, the last divisor i.e., 5 is the HCF of 210 and 55.

âˆ´ 5 = 210 Ă— 5 + 55y

â‡’ 55y = 5 - 1050 = -1045

â‡’ y = -19

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