18 times a positive integer is more than its square by 80, then the positive integer is Options:
A) 13 B) 10 C) 11 D) 12 E) 14
Explanation:   Let the number be x. Then,   18x = x2 + 80   =&gt; x2 - 18x + 80 = 0   =&gt;(x - 10)(x - 8) = 0   =&gt; x = 10 or 8   Answer: 10
<result>B</result>
18 times a positive integer is more than its square by 80, then the positive integer is