Proportions & Percent
A price of $80 is increased by 25%, then decreased by 20%. Final price?
$80
If today is Monday, what day is 3 days later?
Thursday
Evaluate: 23 (5 - 3) + 6
11
Mean of: 10, 15, 20, 25
17.5
Equivalent ratio to 3:5 with 20 second term
12:20
Find area of triangle: base 15, height 8
60
if x/5 = 12/20, find x ?
9
A number is even and greater than 10 but less than 15. Name one.
12 or 14
Solve: 3x+5=2x+17
x = 12
Median of: 4, 12, 7, 9, 15, 3
8
180 miles in 3 hours → unit rate
60 mph
Find missing side of rectangle if area = 96 and one side = 12
8
A shirt is discounted 30% and then taxed 8%. Original price is $50. Final cost?
$37.80
A class has 12 boys and 8 girls. What fraction are girls?
2/5
Simplify: 4(2x−3)−5x+7
5x − 23
Range: 22, 5, 17, 30, 11
25
4 cups for 10 cookies → how much for 25 cookies?
10 cups
Volume of prism: base area 24, height 10
240
A tank is 40% full. After adding 12 gallons, it is 70% full.
What is the tank’s total capacity?
40 gallons
A bag has 3 red, 2 blue, and 5 green marbles. What is the probability of picking blue?
1/5
Solve: x/3 + 5=11
x = 18
Mean is 12. Five numbers total 60. One number is removed (20). What is new mean?
10
6 pencils cost $2.40 → cost per pencil
$0.40
Surface area of cube with side 5
150
A solution is 20% salt. You have 30 cups of this solution.
How many cups of pure salt must be added to make the solution 50% salt?
x = 18
If a question says “least to greatest,” should you sort from biggest to smallest?
No
Twice a number minus 7 is equal to three times the number plus 5. Find the number.
x = - 12
The mean of 6 numbers is 18. When a 7th number is added, the mean becomes 20.
What is the 7th number?
32
Map: 1 in = 12 mi, distance = 3.75 in → real distance
45 miles
A rectangular prism has volume 240. Two dimensions are 5 and 6.
Find the third dimension AND total surface area.
x = 8, Surface Area = 236