on dividing 21 by a number, the quotient is 10 and the remainder is 1. find the divisor.
Pick.
A) 1 B) 2 C) 4 D) 6 E) 7
<gadget id="calculator">21 / 10</gadget>
<output>21/10 = around 2.1</output>

<gadget id="calculator">floor(21/10)</gadget>
<output>2</output>

<result>B</result>
on dividing 21 by a number, the quotient is 10 and the remainder is 1. find the divisor.
floor(divide(21, 10))
"d = ( d - r ) / q = ( 21 - 1 ) / 10 = 20 / 10 = 2 b"