Jackson has 7 blue toy cars, 4 red toy cars and 9 green toy cars. What is the ratio of the number of red toy cars to the number of green toy cars to the number of blue toy cars? <hr> The ratio is <input min="0" type="number" id ="imp5pg091q3_1" class="lineinput" placeholder="?" /> : <input min="0" type="number" id ="imp5pg091q3_2" class="lineinput" placeholder="?" /> : <input min="0" type="number" id ="imp5pg091q3_3" class="lineinput" placeholder="?" />