SOLUTION: Ten years ago Emily's age was 4 times bigger than her sister's. If the age of her sister is 13 today, how old will Emily be five years from now.

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Question 1196003: Ten years ago Emily's age was 4 times bigger than her sister's. If the age of her sister is 13 today, how old will Emily be five years from now.
Found 3 solutions by Alan3354, josgarithmetic, ikleyn:
Answer by Alan3354(69443)   (Show Source):
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Ten years ago Emily's age was 4 times bigger than her sister's. If the age of her sister is 13 today, how old will Emily be five years from now.
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Bigger? As in older?
Is she 4 time older? Or 4 times as old?

Answer by josgarithmetic(39617)   (Show Source):
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Today, x, the sister
e, emily

Ten years ago,
x-10, the sister
e-10, emily

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Ten years ago Emily's age was 4 times bigger than her sister's.
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, literally.

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If the age of her sister is 13 today,
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------------Emily's age today.

Five years from now, Emily will be 30.

Answer by ikleyn(52781)   (Show Source):
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.

In English Math literature as textbooks etc., they NEVER use the form " four times older ", since it is ambiguous in English.

The only form " five times as old as " is acceptable, instead, when you write/compose a Math problem for wide audience.

For more information, see the link

https://english.stackexchange.com/questions/221323/has-the-illogical-three-times-bigger-replaced-three-times-as-big-in-common-u