noah and his children went to a grocery store and where they sell apples for $1 each and mangoes for $2 each. Noah has $20 to spend and must buy at least 9 apples and mangoes altogether. If Noah decided to buy 4 apples, determine the maximum number of mangoes that he could buy. If there are no possible solutions, submit an empty answer

Since Noah has decided to buy 4 apples, that means he has decided to spend $4 on apples. Deducting that from $20, you are left with $16. Divide this total by the cost of each mango, $2, and you get the result as 8 mangos.

Hope this helps!

$25.5.

Step-by-step explanation:    

We have been given that Aubrey's dinner cost $85. She tips the waitstaff 30% for excellent service.

To find the tip given to waitstaff by Aubrey we will find 30% of 85.

Therefore, Aubrey gave $25.5 as tip to the waitstaff for their excellent service.