Your are y years old. Your sister is 3 years older than you. Your uncle is 4 times older than your sister. Write and simplify an expression that represents your uncle's age.

4y + 12 years

Step-by-step explanation:

Your age is specified as y years.

Your sister is older than you by 3 years. Expressing sister's age mathematically, it is equal to (y + 3) years

Your uncle's age is four times your sister's age.

Hence uncle's age = / [4 * (y+3) / ] years

Simplifying, uncle's age = / [ (4*y + 4*3) / ] years

In other words, uncle's age = / [ (4y + 12) / ] years

Hence the required age of the uncle can be represented as 4y + 12 years.