01-11-2020
Mathematics

contestada

ben is 5 years older than his sister Kelsey. the sum of their ages is 10 less than 3 times Kelsey's age. how old is ben?

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01-11-2020

Answer:

Ben is 20 years old.

Step-by-step explanation:

Ben: x + 5

Kelsey: x

x + 5 + x = 3x - 10

2x + 5 = 3x - 10

-1x = -15

x = 15

Kelsey is 15 years old, Ben is 20 years old.

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