Question

Im having trouble on some of these pls help

1. 72% of ______ days is 18 days
2.If the sales tax in a town is 5% and Amanda pays $10 in tax on her purchase what was the cost of the item?
3.If 7 out of 25 students have a pet, what percent of the class has a pet?

Answer 1

1. To find the number of days, divide 18 by 0.72. 2. To find the cost of the item, divide $10 by 0.05. 3. To find the percent of the class with a pet, divide the number of students with a pet by the total number of students and multiply by 100.

Step-by-step explanation:

1. Let's call the number of days 'x'. We know that 72% of x is 18 days. So, we can write the equation as: 0.72x = 18. To find the value of x, we divide both sides of the equation by 0.72: x = 18 / 0.72 = 25.

2. Let's call the cost of the item 'C'. We know that the sales tax is 5% and Amanda paid $10 in tax. So, we can write the equation as: 0.05C = 10. To find the value of C, we divide both sides of the equation by 0.05: C = 10 / 0.05 = $200.

3. We know that 7 out of 25 students have a pet. To find the percent of the class that has a pet, we divide the number of students with a pet by the total number of students and multiply by 100: (7 / 25) * 100 = 28%.