Solution
Let the two numbers be $$3x$$ and $$4x$$
$$=$$> HCF of two numbers = $$x$$
Given, LCM of two numbers = 120
We know that, Product of two numbers is equal to Product of LCM and HCF of two numbers
$$=$$> $$3x\times4x=120\times x$$
$$=$$> $$x=10$$
$$\therefore\ $$Sum of the numbers = $$3x+4x=7x=7\left(10\right)=70$$
Hence, the correct answer is Option C
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