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PASSAGEDirections Read the given passage carefully and find the answers of following questions. LCM of two numbers A and B is 60. B is a 2-digit number which leaves remainder as 2 when divided by 6. It is also given B>A.Read the instructions carefullyFind Maximum value of A+B.

Question

PASSAGEDirections Read the given passage carefully and find the answers of following questions. LCM of two numbers A and B is 60. B is a 2-digit number which leaves remainder as 2 when divided by 6. It is also given B>A.Read the instructions carefullyFind Maximum value of A+B.

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Solution

To find the maximum value of A+B A + B given the conditions in the passage, we need to follow these steps:

  1. Understand the conditions:

    • The Least Common Multiple (LCM) of A A and B B is 60.
    • B B is a 2-digit number that leaves a remainder of 2 when divided by 6.
    • B>A B > A .
  2. Identify possible values for B B :

    • Since B B leaves a remainder of 2 when divided by 6, B B can be expressed as B=6k+2 B = 6k + 2 where k k is an integer.
    • B B must be a 2-digit number, so 10B99 10 \leq B \leq 99 .
  3. List the possible values of B B :

    • Start with k=1 k = 1 : B=6(1)+2=8 B = 6(1) + 2 = 8 (not a 2-digit number)
    • k=2 k = 2 : B=6(2)+2=14 B = 6(2) + 2 = 14
    • k=3 k = 3 : B=6(3)+2=20 B = 6(3) + 2 = 20
    • Continue this process until B B exceeds 99:
      • B=26,32,38,44,50,56,62,68,74,80,86,92,98 B = 26, 32, 38, 44, 50, 56, 62, 68, 74, 80, 86, 92, 98
  4. Check the LCM condition for each B B :

    • The LCM of A A and B B is 60. We need to find pairs (A,B)(A, B) such that their LCM is 60.
    • For each B B , find the corresponding A A such that LCM(A,B)=60 \text{LCM}(A, B) = 60 .
  5. Calculate A A for each B B :

    • Use the formula for LCM: LCM(A,B)=A×BGCD(A,B) \text{LCM}(A, B) = \frac{A \times B}{\text{GCD}(A, B)} .
    • For each B B , find A A such that A×BGCD(A,B)=60 \frac{A \times B}{\text{GCD}(A, B)} = 60 .
  6. Find the maximum value of A+B A + B :

    • Check each valid pair (A,B)(A, B) and calculate A+B A + B .
    • Identify the maximum value of A+B A + B .

Let's go through the calculations for each B B :

  • For B=14 B = 14 :

    • LCM(A,14)=60 \text{LCM}(A, 14) = 60
    • Possible A A values: 30 (since LCM(30,14)=60 \text{LCM}(30, 14) = 60 )
    • A+B=30+14=44 A + B = 30 + 14 = 44
  • For B=20 B = 20 :

    • LCM(A,20)=60 \text{LCM}(A, 20) = 60
    • Possible A A values: 15 (since LCM(15,20)=60 \text{LCM}(15, 20) = 60 )
    • A+B=15+20=35 A + B = 15 + 20 = 35
  • For B=26 B = 26 :

    • LCM(A,26)=60 \text{LCM}(A, 26) = 60
    • No valid A A (since 26 is not a factor of 60)
  • For B=32 B = 32 :

    • LCM(A,32)=60 \text{LCM}(A, 32) = 60
    • No valid A A (since 32 is not a factor of 60)
  • For B=38 B = 38 :

    • LCM(A,38)=60 \text{LCM}(A, 38) = 60
    • No valid A A (since 38 is not a factor of 60)
  • For B=44 B = 44 :

    • LCM(A,44)=60 \text{LCM}(A, 44) = 60
    • No valid A A (since 44 is not a factor of 60)
  • For B=50 B = 50 :

    • LCM(A,50)=60 \text{LCM}(A, 50) = 60
    • Possible A A values: 6 (since LCM(6,50)=60 \text{LCM}(6, 50) = 60 )
    • A+B=6+50=56 A + B = 6 + 50 = 56
  • For B=56 B = 56 :

    • LCM(A,56)=60 \text{LCM}(A, 56) = 60
    • No valid A A (since 56 is not a factor of 60)
  • For B=62 B = 62 :

    • LCM(A,62)=60 \text{LCM}(A, 62) = 60
    • No valid A A (since 62 is not a factor of 60)
  • For B=68 B = 68 :

    • LCM(A,68)=60 \text{LCM}(A, 68) = 60
    • No valid A A (since 68 is not a factor of 60)
  • For B=74 B = 74 :

    • LCM(A,74)=60 \text{LCM}(A, 74) = 60
    • No valid A A (since 74 is not a factor of 60)
  • For B=80 B = 80 :

    • LCM(A,80)=60 \text{LCM}(A, 80) = 60
    • No valid A A (since 80 is not a factor of 60)
  • For B=86 B = 86 :

    • LCM(A,86)=60 \text{LCM}(A, 86) = 60
    • No valid A A (since 86 is not a factor of 60)
  • For B=92 B = 92 :

    • LCM(A,92)=60 \text{LCM}(A, 92) = 60
    • No valid A A (since 92 is not a factor of 60)
  • For B=98 B = 98 :

    • LCM(A,98)=60 \text{LCM}(A, 98) = 60
    • No valid A A (since 98 is not a factor of 60)

From the valid pairs, the maximum value of A+B A + B is 56 56 when A=6 A = 6 and B=50 B = 50 .

Answer: The maximum value of A+B A + B is 56.

This problem has been solved

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