1. Total sales of copper in 2003 and 2004 constitute what percentage of the average sales of silver in 2004 and 2005.
a. 150%
b. 160%
c. 155%
d. 175%
e. 180%
2. What will be the sales of gold in 2006 if it’s equal to the average sales of gold in 2002,2004 and 2005 together?
a. 88 2/3
b. 83 1/3
c. 88 1/3
d. 83 2/3
e. 83 2/5
3. What will be the total sales of all three in 2006 if it is equal to the 1.5 times the sum of average sales of silver in 2002-2003 and copper in 2003-2004?
a. 424.4
b. 444.5
c. 442.5
d. 454.5
e. 445.2
4. Sales of silver in all four years constitute what percentage of the total sales of gold and copper in 2003-2004.
a. 143%
b. 141%
c. 136%
d. 134%
e. 131%
5. What is the ratio between the total sales of silver in 2003-2004 to the difference between the average sales of copper and gold in 2002-2003 is?
a. 68:25
b. 25:68
c. 34:13
d. 41:15
e. 13:34
Answers: 1.b 2.b 3.c 4.d 5.a
Solutions
Average sales of silver in 2004 and 2005= (180+220)/2= 200 tonnes
Percentage= (320/200)*100= 160% (b)
= (110+160)/2+ (160+160)/2
=135+160=295
1.5 times 295= 1.5*295= 442.50 (c)
Total sales of gold and copper in 2003-2004=500 tonnes
Percentage= (670/500)*100= 134% (d)
Difference between the average sales of copper and gold in 2002-2003 is(220+160)/2-(60+80)/2
=190-65=125
Ratio is 340:125=68:25(a)
