A group of friends walked into Juju’s Juice Bar ordered a glass of fruit juice each. They spent a total of $94. Some of them ordered mango juice, which sells for $5 a glass, while others asked for pineapple juice, at $6 a glass. If $54 was spent on pineapple juice, how many people were in the group? Let's be accurate as possible.
The amount spent on mango juice is 94 - 54 = 40 dollars. Dividing the 40 dollars by the cost of a glass of mango juice gives us 40 / 5 = 8 people. Since a glass of pineapple juice goes for $6, the number that ordered is 54 / 6 = 9 people. Adding both numbers gives a total of 8 + 9 = 17 people.
The answer: 17.