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29 December, 17:32

A stationary shop has a sale on address books and calendars. two of the address books and one calendar cost a total of $10. one of the address books and three calendars cost a total of $15. how much does one calendar cost?

A) $6

B) $3

C) $1

D) $4

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Answers (1)
  1. 29 December, 17:39
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    2b+1c=10 so 1c = 10-2b

    1b+3c = 15 so 1b=15-3c substitute in first

    So 1c = 10-2 (15-3c) = 10-30+6c = - 20+6c

    20=6c-1c

    20 = 5c

    20/5=c

    4=c

    AnswerD
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