a ratio between two numbers is 4: 5 and their l. c. m. is 200. the first number is  Options.
A) 60	B) 40	C) 20	D) 15	E) none
<gadget id="calculator">4 * 5</gadget>
<output>20</output>

<gadget id="calculator">200 / 20</gadget>
<output>10</output>

<gadget id="calculator">10 * 4</gadget>
<output>40</output>

<result>B</result>
a ratio between two numbers is 4: 5 and their l. c. m. is 200. the first number is
multiply(divide(200, multiply(4, 5)), 4)
"sol . let the required numbers be 4 x and 5 x . then , their l . c . m . is 20 x . ∴ 20 x = 200 ⇔ x = 10 . hence , the first number is 40 . answer b"