Answer: 30 cheese pizzas
Step-by-step explanation:
Let's make it simple. All you're doing is equivalent fractions.
6  x  5 =  ?
- Â Â Â Â Â Â Â -
7  x  5 =  35
6x5= 30
7x5= 35
30 cheese pizzas would be ordered if they ordered 15 pepperoni pizzas
Hope this helped :)