20 people paid 20 per person for food and only 30% was used how much money is left over

280

Step-by-step explanation:

First determine how much was paid for food

20 dollars times 20 people

20*20 = 400

We used 30% of that

400 *30%

Change to decimal form

400 *.30

120 was used

How much was left

400-120 = 280

280 was left

The question is asking us to answer the following question: It is 3:00pm here, and Australia is 13 hours ahead of us. What time is it in Australia?. What we know is that Australia always has 13 hours "earlier" - this is what it means that it's ahead of us. This means that we have to add 13 hours. first, let's add 9 (4 will be left) hours, we will end up at midnight. Then we add further 4 hours, and we end up at 4 AM. So the answer is that it's 4 AM of the following day.