Answer:
Sister- 11 Years Old
Andre- 13 Years Old
Brother- 16 Years Old
Step-by-step explanation:
Multiply 16 times 3, minus 1= 47
Then add 11, 13, 16 and 47 up
You'll end up with 87 as your answer
Andre is 13 years old, his brother is 16 years old, his sister is 11 years old and his mother is 47 years old.
Let w represent Andre age, x represent his brothers age, y represent his sister age and z represent the mother age.
He is three years younger than his brother, hence:
w = x - 3
w - x = -3 (1)
He is 2 years older than his sister, hence:
w = y + 2
w - y = 2 (2)
My mom's age is one less than three times my brother's age, hence:
z = 3x - 1
3x - z = 1 (3)
When you add all our ages, you get 87, hence:
w + x + y + z = 87 (4)
Solving equations 1, 2, 3 and 4 simultaneously gives:
w = 13, x = 16, y = 11, z = 47
Hence Andre is 13 years old, his brother is 16 years old, his sister is 11 years old and his mother is 47 years old.
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