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1 November, 08:17

Keli is celebrating her birthday and she wants a ratio of red balloons to blue balloons that is 4:3. If she ordered 21 balloons for her party how many would she have of each color?

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  1. 1 November, 08:35
    0
    12 red and 9 blue.

    4+3=7

    21/7=3

    3x4=12 red

    3x3=9 blue
  2. 1 November, 08:41
    0
    Let's call the # of blue balloons = B and the # of green balloons = G

    We know that B + G = 21 balloons in total, and that the ratio of B:G = 4:3

    From there, we can see that if B/G = 4/3, 3B = 4G

    Now, let's substitute one for the other - since B + G = 21 → B = 21 - G

    3 * (21 - G) = 4G → 63 - 3G = 4G → 63 = 7G → 9 = G

    Since B + G = 21 and G = 9, there were 12 blue balloons at Kali's party.
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