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Evgesh-ka [11]
2 years ago
11

Emma is 10 years old. she asked her father how old he is. her father answered, "when you are my age I will be 70." how old is Em

ma's father.
Mathematics
2 answers:
umka2103 [35]2 years ago
8 0

Answer:

40

Step-by-step explanation:

Emma age: yE = 10 + x   (x is timeline)

Father age: yF = A + x (x is timeline, A is Father age today)

in time x1: Emma will be A years old, and Father will be 70 years old.

yE (x1) = 10 + x1 = A

yF (x1) = A + x1 = 70

System of equations with unknown values: x1 and A.

substract equation 1 - equation 2:

10 - A = A - 70 ⇒ 80 = 2A ⇒ A = 40

So, father is 40 years old now

melamori03 [73]2 years ago
8 0

Answer: emmas father is 40 years old

Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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