What must be added to each term of the ratio 2 : 3, so that it may become equal to 4 : 5?	Choose the correct answer
A) 2 B) 4 C) 6 D) 9 E) 8
Let the number to be added be x, then (2 + x) : (3 + x) = 4 : 5   ⇒ (2 + x)/(5 + x) = 4/5   5(2 + x) = 4(3 + x)   10 + 5x = 12 + 4x   5x - 4x = 12 - 10= 
<gadget id="calculator">12 - 10</gadget>
<output>2</output>
2   2nswer:2
<result>A</result>
What must be added to each term of the ratio 2 : 3, so that it may become equal to 4 : 5?