There are 19 marbles in a bowl, 5 of which are yellow. The remainder are split into blue marbles and red marbles in the ratio 3:4 respectively. How many more red marbles than yellow marbles are there?
5 out of 19 marbles are yellow so the remainder which is 19-5 = 
<gadget id="calculator">19-5</gadget>
<output>14</output>
14 marbles are blue and red
14 marbles are split into blue and red in the ratio 3:4 so each "share" is 14/(3+4) = 
<gadget id="calculator">14/(3+4)</gadget>
<output>2</output>
2 marbles.
There are 4 "shares" of red marbles which totals to 4*2 = 
<gadget id="calculator">4*2</gadget>
<output>8</output>
8 red marbles.
There are 8-5 = 
<gadget id="calculator">8-5</gadget>
<output>3</output>
3 more red marbles than yellow marbles.

<result>3</result>