Percents
3 is what percent of 9?
33%
1/2x = 3
x=6
7+5 = ?
y = 4 - x
Solve for x.
x = 4-y
2x + 4 = -18 - 9x
x= -2
What is 40% of 200?
80
120/x = 24
x=5
36-19 =?
17
6y = 7+4x
Solve for x
x= (6y-7)/4
(x+4) - 3x = 1 + x
x=1
20% of what number is 16?
80
x=8
4*8 - 5 = ?
27
x/a = y/b
Solve for b
b = ay/x
0.25x + 0.1x = 9.8
x=28
Water is said to be 71% of the Earth's surface. The total surface area of Earth is roughly 197,000,000 square miles. How many square miles are covered in water?
139,870,000 square miles
(x+2)/5 = (2x-11)/7
x=23
(20-5)*4 + 7 = ?
67
(x+7)/(y-4) = 3
Solve for y.
y=(x+19)/3
1/2x + 1/3(x-6) = 5/6x +2
no solution
Mr. Lim teaches an algebra class. 60% are only children and 40% of them have siblings. Among those with siblings, 50% of them have more than 2 siblings. There are 4 students with 1 sibling. How many students are in the class?
20
A computer takes 15 minutes to download a 45-min TV show. How long will it take to download a 2-hr movie?
40 minutes
(80/5)*3 = ?
48
(rx+sx)/t = 6
Solve for x.
x=6t/(r+s)
A hairdresser is deciding where to open her new studio. If she chooses Studio A, she pays $1200 in rent and would charge $45/haricut. If she chooses Studio B, she pays $1800 in rent and would charge $60/haircut. How many haircuts would she have to give in one month to make the same profit at both studios?
40 haircuts