Bunuel wrote:
The number of solutions of the equation 2x + y = 40 where both x and y are positive integers and x <= y is:
A. 7
B. 13
C. 14
D. 15
E. 28
\(2x + y = 40\) and x ≤ y
First solution is x =1 and y = 38
Last solution is x =13 and y = 14
and x will increase by 1 unit for each distinct solution
so total solutions = 13
Answer:Option B
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