86. After 6 new students entered the Happy Hearts Childcare

86. After 6 new students entered the Happy Hearts Childcare Center and 2 students exited, there were 3 times as many students as before. How many students were present before students entered and exited the center?87. The product of three consecutive prime numbers is 2431. What is their sum? 89. Bennie is ordering a new computer. A 6.25% sales tax will be added to the price of the computer, and then an $11 delivery charge will be added to that total. If Bennie has $500 to spend, what is the maximum price of a computer that he can afford? Express your answer to the nearest whole number.90. Each team in the softball league plays each of the other teams exactly once. If 21 games are played, how many teams are in the league?

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