There are 21 girls and 12 boys in the chorus class. About what percentage of the boys is the girls in the class?

57%  

Step-by-step explanation:

21 girls

12 boys

12/21 = 57%

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120th caller

Step-by-step explanation:

According to the problem, calculation of the given data are as follows,

$100 bill = 30th caller

Movie tickets = 40th caller

So, to find out first to win both prizes, we will use LCM method,

LCM of 30 and 40 =       10 | 30 , 40

                                            | 3    , 4

LCM of 30 and 40 = 10 × 3 × 4 = 120

Hence, 120th caller will be the first to win both prizes.