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5 June, 03:39

Together, Sarah's two cats have the same mass as her dog, 11 kg. The mass of one cat is

1500 g greater than the mass of the other. What are the masses of the two cats?

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Answers (2)
  1. 5 June, 03:45
    0
    First, lets do all calculations in kg. 1kg=1000 grams

    Lets set 1 cat's mass as x.

    Lets set the other cat's mass as y.

    1) x+y=11

    2) y=x+1.5

    Lets plug eq 2 into eq 1.

    x+x+1.5=11

    2x+1.5=11

    2x=9.5

    x=4.75 kg

    If one cat weighs 4.75 kg, then the other must weigh 6.25 kg.
  2. 5 June, 04:06
    0
    So cat1=x

    cat2=y

    x+y=11kg

    11kg=11000g

    x=y+1500

    subsitute

    y+1500+y=11000

    subtract 1500

    2y=9500

    divide by 2

    y=4750

    subsitue

    x=4750+1500

    x=6250

    one cat weighs 6250g and the other weighs 4750g
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