Melissa gets $2 more a week in allowance than 2 times her friend Monica’s allowance. If Melissa gets $20 in allowance each week, how much does Monica get? Christina charges a flat fee of $10 plus $3 per child when she babysits for an hour. How many children did Christina babysit if she made $16 an hour? There are 27 basketball teams in the Storyville Park District. This is 5 less than 2 times the number of teams in the Friendly Village Park District. How many basketball teams are in the Friendly Village Park District? You go to a concert and purchase 4 identical t-shirts and 1 poster. The poster costs $14 and you spend $98 in all. How much did 1 t-shirt cost?
Melissa gets $20 in allowance each week, which is $2 more than 2 times Monica's allowance. Let M be Monica's allowance.
Melissa's allowance: 2M + $2 = $20
2M = $18
Monica's allowance: M = $<<9=9>>9.
Christina charges $3 per child, so she babysat for $16 - $10 = $<<16-10=6>>6 per child.
Christina babysat for $16, so she babysat for $6 per kid for $16 / $6 = <<16/6=2.67>>2.67 kids.
She has 2 children, so she sat for 2.67 kids = 2 kids.
There are 27 basketball teams in the Storyville Park District, which is 5 less than 2 times the number of teams in the Friendly Village Park District. Let F be the number of teams in the Friendly Village Park District.
27 = 2F - 5
32 = 2F
The Friendly Village Park District has F = 32 / 2 = <<32/2=16>>16 basketball teams.
You spend $98 in all on 4 t-shirts and 1 poster, so 4t + $14 = $98
4t = $84
The cost of 1 t-shirt is $84 / 4 = $<<84/4=21>>21. Answer: \boxed{21}.