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Answer:
Marc's age is 12
Step-by-step explanation:
Let
x ----> Marc's age
y ---> Tony's age
z ---> Ben's age
we know that
the sum of their ages is 40
so
-----> equation A
Marc is half as old as Tony
so
----> equation B
Marc is three times as old as Ben
so

----> equation C
substitute equation B and equation C in equation A

solve for x


therefore
Marc's age is 12
V-39=-16
V-39+39=-16+39
V=23
It does if you're rounding to the nearest 1/2 .
Answer:
Thus, 5/11 is the simplified fraction for 55/121 by using the GCD or HCF method. Thus, 5/11 is the simplified fraction for 55/121 by using the prime factorization method.
I hope it's helpful!