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maksim [4K]
3 years ago
5

Five times Carl's age plus three times Jill's age equals 110. Jill's age is also two times Carl's age. How old is Carla ?

Mathematics
1 answer:
aleksklad [387]3 years ago
6 0
X - Carl's age
y - Jill's age

5x+3y=110 \\
y=2x \ \ \ |\times (-3) \\ \\
5x+3y=110 \\
\underline{-3y=-6x} \\ 5x+3y-3y=110-6x \\ 5x=110-6x \\ 5x+6x=110 \\
11x=110 \\
x=10

Carl is 10 years old.
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