The ratio of two quantities is 10 : 7. If each of the quantities is increased by 2, their ratio changes to 15:11 then the greatest number is? Pick:
A) 10  B) 12  C) 15  D) 16  E) 20
Let the numbers be 10x and 7x   Then 10x+2 / 7x+2 = 15/11   110x+22 = 105x+30   5x = 8   x = 1.6   Greatest number = 10*1.6= 
<gadget id="calculator">10*1.6</gadget>
<output>16</output>
16   Answer is 16
<result>D</result>
The ratio of two quantities is 10 : 7. If each of the quantities is increased by 2, their ratio changes to 15:11 then the greatest number is?