6_2 Final Review

Percent

100

45% of what number is 17.1?

38

200

What percent of the first 20 natural numbers (1,2,3,...) are one digit numbers?

45%

300

0.2c is what percent of 4c?

5%

400

The temperature decreased by 60%, and then it increased by 80%. By what percent did the temperature change?

Decreased by 28%

Calculate

100

 a = -4, b = 3, c = 5, d = -3

abs(a-b)-abs(c+d)=?

5

200

(15/17*18/190)*(19/18*17/45)

1/30

300

(1-1/10)*(1-1/9)*(1-1/8)*...*(1-1/3)*(1-1/2)

1/10

400

268*82+268*17-168*99

9900

Equations

100

92+56/(14-x)=100

x=7

200

(x-4)/5-(x+1)/6=1/3

x=39

300

0.35/(2/3x)=0.45/(x-10)

x=70

400

13(6-x)-4(3x+12)=0

x=1.2

SAT

100

Solve for x:

7/9x-4/9x=1/4+5/12

x=2

200

If 5x +6 =10, what is the value of 10x +3 ?

(A) 4     (B) 9     (C) 11     (D) 20

C

300

Solve for n:

abs(n-1)+1

(A) 0   (B) 1    (C) 2    (D) No solution

D

400

If 

abs(x-2)=p

where x < 2, then x - p = ?

(A) -2    (B) 2    (C) 2-2p   (D) 2p-2 

C

Mixed Problems

100

Divide the number 60 in a ratio of 2 : 3 : 5.

12, 18, 20

200

Find the number if
6% of it is 20% of 6.

20

300

Find the number if
4.5% of it is 23% of 45.

230

400

If the sum of three consecutive numbers is 852, what is the middle number?

284