hannahgrace325
02.11.2020 •
Mathematics
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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Ответ:
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.
Ответ:
97
Step-by-step explanation:
10+14=97