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At his school's spring carnival, Lorenzo is in charge of the balloon-launcher contest. In this contest, each team builds a catapult to launch water balloons at a target. Lorenzo gives a bucket of $15$ water balloons to each team in the contest. In all, he gives out $90$ water balloons.$\newline$Which equation can you use to find the number of teams $t$ in the contest?$\newline$Choices:$\newline$(A) $t - 15 = 90$$\newline$(B) $\frac{t}{15} = 90$$\newline$(C) $15t = 90$$\newline$(D) $t + 15 = 90$$\newline$Solve this equation for $t$ to find the number of teams in the contest.$\newline$$\_\_\_$ teams$\newline$