unicornfangs
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My brother is 5 years older than me. My sister is 3 years younger than me.
a. How old was I be when my brother was 10?
b. How old will my sister be when my brother is 29?
c. How old will my sister be when I am n years old?
d. How old was I when my brother was k years old?
e. How much is my brother older than my sister?

Respuesta :

AestheticPerson

Answer:

A) You would be 5

B) She would be 21

C) (Im guessing n in 9?)  She would be 6 then

D) (idk what k is)

E)7 Years apart

Hope this helps

Step-by-step explanation:

Say you are X years old, your brother is Y years old, are your sister is Z years old.

Your brother is 5 years older than you can be shown as the equation:

Y = X + 5

or

X = Y - 5

Your sister is 3 years younger than you can be shown as:

Z = X - 3

or

X = Z + 3

(a) When your brother was 10, X = 10 - 5, so you were 5.

(b) When your brother is 29, X = 29 - 5, so you were 24. When you were 24, Z = 24 - 3, your sister was 21.

(c) When you were n, you can just use the equation above, but switch the variables: Z = N - 3.

(d) When your brother was K: X = K - 5

(e) Y = X + 5 and X = Z + 3

Y = (Z + 3) + 5

Y = Z + 8

So your brother is 8 years older than your sister.

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