if x is equal to the sum of the integers from 40 to 50, inclusive, and y is the number of even integers from 40 to 50, inclusive, what is the value of x + y? Choose the most appropriate option
A) 171
B) 281
C) 391
D) 501
E) 613
<gadget id="calculator">40 + 50</gadget>
<output>90</output>

<gadget id="calculator">90 / 2</gadget>
<output>45</output>

<gadget id="calculator">50 - 40</gadget>
<output>10</output>

<gadget id="calculator">10 + 1</gadget>
<output>11</output>

<gadget id="calculator">45 * 11</gadget>
<output>495</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<gadget id="calculator">495 + 6</gadget>
<output>501</output>

<result>D</result>
if x is equal to the sum of the integers from 40 to 50, inclusive, and y is the number of even integers from 40 to 50, inclusive, what is the value of x + y?
add(multiply(divide(add(40, 50), const_2), add(subtract(50, 40), const_1)), add(divide(subtract(50, 40), const_2), const_1))
"sum s = n / 2 { 2 a + ( n - 1 ) d } = 11 / 2 { 2 * 40 + ( 11 - 1 ) * 1 } = 11 * 45 = 495 = x number of even number = ( 50 - 40 ) / 2 + 1 = 6 = y x + y = 495 + 6 = 501 d"