the ratio of the ages of maala and kala is 3: 5. the total of their ages is 3.2 decades. the proportion of their ages after 0.8 decades will be [ 1 decade = 10 years ] Choose one:
A) 6 : 5
B) 5 : 7
C) 4 : 5
D) 7 : 9
E) 3 : 6
<gadget id="calculator">3.2 * 10</gadget>
<output>32</output>

<gadget id="calculator">3 + 5</gadget>
<output>8</output>

<gadget id="calculator">32 / 8</gadget>
<output>4</output>

<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<gadget id="calculator">0.8 * 10</gadget>
<output>8</output>

<gadget id="calculator">12 + 8</gadget>
<output>20</output>

<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">20 + 8</gadget>
<output>28</output>

<gadget id="calculator">20 / 28</gadget>
<output>5/7 = around 0.714286</output>

<result>B</result>
the ratio of the ages of maala and kala is 3: 5. the total of their ages is 3.2 decades. the proportion of their ages after 0.8 decades will be [ 1 decade = 10 years ]
divide(add(multiply(divide(multiply(3.2, 10), add(3, 5)), 3), multiply(0.8, 10)), add(multiply(5, divide(multiply(3.2, 10), add(3, 5))), multiply(0.8, 10)))
let , maala ’ s age = 3 a and kala ’ s age = 5 a then 3 a + 5 a = 32 a = 4 maala ’ s age = 12 years and kala ’ s age = 20 years proportion of their ages after 8 is = ( 12 + 8 ) : ( 20 + 8 ) = 20 : 28 = 5 : 7 answer : b