Question

Can someone please help me I dont understand how to do these!!!???

Answer 1

1) 450

2) 250

3) 144

4) 800

5) 18

Explanation:

the missing value in all the questions = x

1) 20% × x = 90

20/100 × x = 90

20x = 9000

x = 450

2) 60% × x = 150

60x/100 = 150

60x = 15000

x = 250

3) 80% × 180 = how much Lauren has read

80/100 × 180 = 144 pages

4) 75% of the full dose = 600

75% × x = 600

75x / 100 = 600

75x = 60000

x = 800 mg (the full dose)

5) 20% of 90 = x

20/100 × 90 = x

x = 18

Answer 2

Question 1:

20% of what number is 90.

Number: 450

Work:

20% × x = 90

multiply both sides by 100 and divide by 20

90 x 100/20

9000/20 = 450

x = 450

Question 2:

60% of what number is 150

Number: 250

Work:

60% × x = 150

multiply both sides by 100 and divide by 60

150 x 100/60

15000/60 = 250

x = 250

Question 3:

Pages: 144

Work:

.8 x 180 = 144

Question 4:

Full dose: 800 mg

75% = 3/4

Work:

600 = 3/4

600 (4/3) = 3/4(4/3)

2400/3 = 1

800 = 1

600 is 75% of 800.

Question 5:

Answer: 18

Work:

(20 x 90)/100 = 1800

1800/100 = 18