Kelsey calculates that she spends 20% of a school day in science class. If she spends 55 minutes working in science class, how many minutes does Kelsey spend in school?

275 minutes

Step-by-step explanation:

1. 20% = 20/100

2. 55 minutes is a portion of the TOTAL amount of school so as a fraction is can be said as 55/x

3. now set up the proportion

20/100 = 55/x

we know this because 55 minutes = 20% of a school day

4. solve using cross multipication

20/100 = 55/x

20(x)=55(100)

20x=5500

x= 5500/20

x= 275

I hope this helped!

3< x< 5

step-by-step explanation:

|x - 4| < 1

there are two solutions, one positive and one negative.   remember to flip the inequality when taking the negative solution

x-4 < 1       x-4 > -1

add 4 to each side

x-4+4 < 1+4       x-4+4 > -1+4

x< 5                 x> 3

3< x< 5