Try to answer the following questions in your head. For this quickie quiz to DO NOT need to include your units. (Generally, in other settings you should include your units on all answers.)
Find the density of a substance that is 750 grams and 30 cubic cm. (Hint: density is in grams per cubic cm.)
25
250
450
22500
45
Find the volume of a block of concrete which is 20 cm tall, 30 cm wide, and 40 cm long. (You may leave off the units from your answer.)
24000
1200
12000
14000
20000
You have 600 mL of a solution. 25% is silver nitrate. How many mL of silver nitrate do you have?
150
25
30
250
300
Solve: 4x = 84
21
22
336
42
8.4
Solve: 30x = 6,000
200
2000
570
300
180,000
If the density of a substance is 10 gm/cu. cm and you have 82.3 cu. cm, how much does it weigh? (Find the mass.)
823
8.23
82.3
41.15
810
Find the volume (in cubic feet) of a slab of concrete which is 3 inches thick, 20 feet wide, and 90 feet long. (You may leave off the units from your answer.) Hint: 3 inches is what fraction of a foot.
450
900
480
45
You have 56 gm of a piece of metal that is iron and copper. 25% is copper. How many grams of copper do you have?
14
5.6
1.6
112
224
How far can a family travel if they average 50 miles per hour for three days of driving and drive 8 hours per day? (You may leave off the units from your answer.)
1200
4000
400
1500
120
How far can a migratory bird travel if it averages 10 miles per hour for one week and flies 12 hours each day. (You may leave off the units from your answer.)