Final answer:
The ratio of balloons that Leo blew up compared to Kathy is 7:5. This ratio shows the relationship between the two numbers, representing how many balloons each person blew up individually.
Step-by-step explanation:
The question asks us to find the ratio of balloons Leo blew up compared to Kathy. The first step is to understand what a ratio represents; it's a way to show the relationship between two numbers indicating how many times the first number contains the second. In this case, Leo blew up 7 balloons and Kathy blew up 5 balloons. Therefore, the ratio of Leo's balloons to Kathy's balloons is simply the number of Leo's balloons divided by the number of Kathy's balloons.
The correct ratio is captured in Option 1: 7:5. This is because ratios are expressed as Leo's balloons to Kathy's balloons. Option 2 (5:7) would represent Kathy's balloons to Leo's, which is not what we're looking for. Options 3 and 4 combine the balloons in a way that isn't relevant to the ratio between Leo and Kathy's individual counts.