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24 May, 01:31

Kylie and her children went into a bakery and she bought $10 worth of donuts and brownies. Each donut costs $1.25 and each brownie costs $2.50. She bought twice as many donuts as brownies. Determine the number of donuts and the number of brownies that Kylie bought.

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Answers (2)
  1. 24 May, 01:46
    0
    4 donuts and 2 brownies

    Step-by-step explanation:

    Guess and check

    2 donuts - -> $2.50

    1 brownie - ->$2.50

    Since the amount of donuts is double,

    we try:

    4 donuts - ->$1.25 (4) = $5

    2 brownies - -> $2.50 (2) = $5
  2. 24 May, 01:55
    0
    she bought 4 donuts and 2 brownies.

    Step-by-step explanation:

    This is a question on simultaneous equations where two variable are given with two or more relational equations. if she bought $10 worth of donuts and brownies, and each donut costs $1.25 and each brownie costs $2.50.

    Then,

    1.25d + 2.50b = 10 where d and b are the numbers of donuts and brownies purchased respectively.

    if She bought twice as many donuts as brownies, then

    d = 2b

    Therefore,

    1.25 (2b) + 2.50b = 10

    5b = 10

    b = 2

    d = 2 * 2 = 4

    Hence she bought 4 donuts and 2 brownies.
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