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kayla has a collection of 1500 pennies. of these pennies, 30% of them are dated before 1980, 45% of them are dated from 1980 to 1990, and the rest are dated after the year 2000. How many pennies are dated after the year 2000?
The ratio of boys to girls in Mrs. Harris class is 2:5 there are 20 girls. what is the total number of students in mrs. harris class
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Answer:
Step-by-step explanation:
Pennies before 1980 = (1500 x 30) / 100 = 450
Pennies between 1980 to 1990 = (1500 x 45) / 100 = 675
Pennies after 2000 = 1500 - (450 + 675) = 375
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no. of boys = 2x
no. of girls = 5x
5x = 20
x = 4
no. of boys = 2 * 4 =8
total no of students = 20 + 8 = 28
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