a mother is twice as old as her daughter 5 years from now she will be thrice as old as her daughter how old is the mother five years from no

Question

a mother is twice as old as her daughter 5 years from now she will be thrice as old as her daughter how old is the mother five years from now

Representation:
equation:

solution:

answer:​

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Ngọc Hoa 2 months 2021-07-19T19:42:55+00:00 1 Answers 3 views 0

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    0
    2021-07-19T19:44:25+00:00

    Answer:

    Let’s define the variables:

    M = mother’s age

    D = daughter’s age.

    “a mother is twice as old as her daughter”

    This can be written as:

    M = 2*D

    “5 years from now she will be thrice as old as her daughter”

    (M + 5) = 3*D

    We want to know how old is the mother five years from now.

    First, our equations are:

    M = 2*D

    (M + 5) = 3*D

    First, we need to isolate one of the variables in one of the equations, because for the solution we want the mother’s age, we should isolate the daughter’s age.

    Let’s isolate D in the first equation:

    M/2 = D

    Now we can replace this in the other equation:

    Now we can replace this on the other equation:

    (M + 5) = 3*(M/2)

    M + 5 – (3/2)*M = 0

    -(1/2)*M + 5 = 0

    5 = (1/2)*M

    2*5 = M = 10

    So the mother is 10 years old (this hasn’t a lot of sense, maybe there is a wrong number on the question)

    and 5 years from now, the mother will be:

    10 + 5 = 15 years old.

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )