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15 December, 21:26

An animal shelter spends $1.00 per day to care for each cat and $7.00 per day

to care for each dog. Claire noticed that the shelter spent $135.00 caring for

cats and dogs on Thursday. Claire found a record showing that there were a

total of 39 cats and dogs on Thursday. How many cats were at the shelter on

Thursday?

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Answers (1)
  1. 15 December, 21:55
    0
    23 cats

    Step-by-step explanation:

    let x be the number of cats at the shelter on Thursday

    and let y be the number of dogs at the shelter on Thursday.

    Now we have two unknown variable x and y so we need at least two equations to solve for both x and y.

    The first equation can be written from the statement "total of 39 cats and dogs on Thursday", which converts to:

    x+y=39

    The second equation can be determined from the sentence "the shelter spent $135.00 caring for cats and dogs on Thursday". Also we know that the shelter spends $1/day for cats and $7/day for dogs which means 1*x (as x is the total number of cats) and 7*y (as y is the total number of dogs on Thursday) and we also know that the shelter spend a total of $135 which means that:

    1x+7y=135

    Now from first equation we can find the value of x which is x=39-y and then we replace this value of x in the second equation and solve for y.

    1 (39-y) + 7y=135

    39+6y=135

    6y=135/39

    6y=96

    y=96/6

    y=16

    Now to find x (the number of cats on Thursday), we put this value of y in the first equation which gives us:

    x=39-16

    x=23
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