correct answer is: c) 410 & 235

Explanation

Let, one number is ‘x’
Another number is ‘y’
According to the question,
\left(x+y\right)=645
\rightarrow x=645-y ———(1)
And, x=\large\frac{y}{2} ——–(2)
According to the question,
645-y=\frac{y}{2}
\rightarrow2\left(645-y\right)=y
\rightarrow1290-2y=y
\rightarrow-2y-y=-1290
\rightarrow-3y=-1290
\rightarrow y=\large\frac{-1290}{-3}
\rightarrow y=430
Put the value in no (1) equation, we get:
x=645-430
\rightarrow x=215
\therefore One number is 430 and another number is 215 .
Ans: The numbers are 430 & 215.

Other versions of this specific question are:
1. Calculate two numbers whose sum is 645, with one number being half of the other.
2. Find the two numbers when their sum is 645 and one number is half of the other.
3. Determine the numbers if their total is 645 and one number is half the value of the other.
4. What are the two numbers if their sum is 645 and one number is half of the other?