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SOLUTIONS TO MATH AND GRAPH SELFTEST
1.
What is the value of ‘a’ in the equation, a = [b/(c + d)] x 100, if b = 6,
c = 6, and d = 114?
a = 5
2.
What is the value of ‘a’ in the equation, a = 10 b
1/2
, if b = 36?
a = 60
3.
What is the reciprocal of .92?
Reciprocal = 1/x = 1/.92 = 1.087
4.
What is the decimal equivalent of .3%?
.3% = .3/100 = .003
5.
What is the percentage equivalent of .1?
.1 = (.1 x 100)% = 10%
6.
What is the value of ‘a’ in the ratio 1:a so that the ratio equals the ratio,
4:6?
a = 6/4 or 1.5
7.
What is the value of ‘a’ in the ratio 1:a so that the ratio equals the ratio,
8:5?
a = 5/8 or .625
8.
If a value increases from 20 to 28, what is the rate of change expressed as a
percentage?
% change = (new value – old value) x 100/old value = (28 – 20) x 100/20 = 40%
9.
If a value is initially equal to 500 and increases by 4%, what is the new
value?
New value = 500 + (.04 x 500) = 520
10.
What are the values of ‘x’ and ‘y’ in the following system of equations,
y = 3x  2 and 2y = 2x + 12?
One way to solve is to multiply the first equation by 2 to yield 2y = 6x  4.
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This note was uploaded on 10/13/2009 for the course ECON 1221 taught by Professor Whitaker during the Winter '09 term at Langara.
 Winter '09
 WHITAKER
 Economics

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