Answer:
There were 6 onion rings and 2 slider in the combination meal.
Step-by-step explanation:
Let x be the number of onion rings and y be the number of slider.
Calories in one onion ring = 45 calories
Calories in one slider = 325 calories
Total number of calories = 920
Thus, we can write the equation:

There are 3 times as many onion rings as the sliders.
Thus, we can write the equation:

Solving the two equation by substitution method, we get,

Thus, there were 6 onion rings and 2 slider in the combination meal.