Marcos is 7 years older than his sister, Rosa. The sum of their ages is less than 3 times Rosa's age. How old is each?
1 answer:
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Answer:
Step-by-step explanation:
we would like to solve the following equation:
in order to do so do cross multiplication:
divide both sides by √3:
since we ended up with a square root on the denominator so we can consider rationalising the denominator to do so multiply both numerator and denominator by √3 which yields:
simplify multiplication:
reduce fraction:
and we are done!