Question:medium

The sum of LCM and HCF of two numbers is 854. If the LCM is 60 times the HCF and one of the numbers is 70, then the other number is:

Updated On: Jan 16, 2026
  • 160
  • 164
  • 168
  • 172
Show Solution

The Correct Option is C

Solution and Explanation

To address this problem, we will establish variables and equations from the provided data.

Let \( H \) represent the HCF of the two numbers and \( L \) represent their LCM. The problem provides the following information:

  • \( L = 60H \)
  • \( L + H = 854 \)

By substituting \( L = 60H \) into the second equation, we get:

\( 60H + H = 854 \)

\( 61H = 854 \)

Calculation of HCF (H)

Solving for \( H \):

\( H = \frac{854}{61} = 14 \)

Calculation of LCM (L)

Now, we calculate \( L \) using the relation \( L = 60H \):

\( L = 60 \times 14 = 840 \)

Identification of the Other Number

Let the two numbers be \( a = 70 \) and \( b \). The relationship between the LCM and HCF of two numbers is:

\( a \times b = L \times H \)

Therefore, we have \( 70 \times b = 840 \times 14 \)

Solving for \( b \):

\( 70b = 11760 \)

\( b = \frac{11760}{70} \)

\( b = 168 \)

Consequently, the other number is 168.

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