what is the number of integers from 1 to 1000 ( inclusive ) that are divisible by neither 20 nor by 35?  Choices:
A) 567 B) 850 C) 560 D) 923 E) 240
<gadget id="calculator">1_000 / 20</gadget>
<output>50</output>

<gadget id="calculator">1_000 / 35</gadget>
<output>200/7 = around 28.571429</output>

<gadget id="calculator">50 + (200/7)</gadget>
<output>550/7 = around 78.571429</output>

<gadget id="calculator">20 * 35</gadget>
<output>700</output>

<gadget id="calculator">1_000 / 700</gadget>
<output>10/7 = around 1.428571</output>

<gadget id="calculator">(550/7) - (10/7)</gadget>
<output>540/7 = around 77.142857</output>

<gadget id="calculator">1_000 - (540/7)</gadget>
<output>6_460/7 = around 922.857143</output>

<result>D</result>
what is the number of integers from 1 to 1000 ( inclusive ) that are divisible by neither 20 nor by 35?
subtract(1000, subtract(add(divide(1000, 20), divide(1000, 35)), divide(1000, multiply(20, 35))))
"in 1000 consecutive numbers , number of multiples of 20 = 1000 / 20 = 50 ( ignore decimals ) in 1000 consecutive numbers , number of multiples of 35 = 1000 / 35 = 28 number of multiples of 20 * 35 i . e . 700 = 1000 / 700 = 1 number of integers from 1 to 1000 that are divisible by neither 20 nor by 35 = 1000 - ( 50 + 28 - 1 ) { using the concept of sets here ) = 923 answer is d"