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Solution



Given
    • John spent a total of $135 on baseball tickets
    • The price of a ticket is either $12 for the field seats or $5 for the balcony.

To find
    • The minimum amount of dollars he could have spent for the $12 tickets?

Approach and Working out
Let John took x tickets of field seats and y tickets of balcony then:
    • 12x + 5y = 135
    • Since we want y to be minimum, let us see if y can 0 then 1, or 2 and so on.
      o x =0 then 5y = 135
         for x =0, 12x =0
         However, it is not an option. So, question must have mentioned that john bought at least one ticket of each type.
      o 12x = 135 – 5y
         135 is a multiple of 5 and 5y is also a multiple of 5.
         So, 12 x also has to be a multiple of 5.
         12 is not a multiple of 5. So, x must be multiple of 5.
      o Hence, x = 0, 5, and so on.
      • However, x =0 does not give the answer.
      • X=5 or 12x = 60 should the least amount spent by Johnf or $ 12 tickets.

Thus, option B is the correct answer.

Correct Answer: Option B
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