SOLUTION: A student paid $ 5.40 for 30 pencils. Some cost 10 cents each and others cost 20 cents.each. How many pencils of the 10 cents type did he buy?

Question 705665: A student paid $ 5.40 for 30 pencils. Some cost 10 cents each and others cost 20 cents.each. How many pencils of the 10 cents type did he buy?
Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website!
A student paid $ 5.40 for 30 pencils. Some cost 10 cents each and others cost 20 cents.each. How many pencils of the 10 cents type did he buy?
**
let x=number of 10-cent pencils bought
30-x=number of 20-cent pencils bought
..
.10x+.20(30-x)=5.40
.10x+6-.20x=5.40
.10x=.60
x=6
30-x=24
number of 10-cent pencils bought=6
number of 20-cent pencils bought=24
RELATED QUESTIONS
If a pencil cost 10-cents, then, the pencils increase to 25-cents each, what is the... (answered by greenestamps)

drawing pencils cost 8 cents each and colored pencils cost 11 cents each . Two dozen... (answered by tommyt3rd)

Vanessa bought 50 pencils for the office. Ten of the pencil cost 50 cents each. Twenty... (answered by richwmiller)

Priscilla has $1.00 to get at least one (or more) pencils. Pencils cost 10 cents each,... (answered by stanbon)

please help me to solve Pencils cost 25 cents apiece. Pens cost 80 cents apiece. Susan (answered by joyofmath)

Pencils cost 25 cents a piece. Pens cost 80 cents a piece. Susan spent 20 dollars for a... (answered by sbasics2005)

Pens and pencils. A bookstore manager plans to spend $60 on pens at 30 cents each, an... (answered by ptaylor)

pencils at the school bookstore cost 8 cents each. stacy buys 3 pencils and her brother... (answered by bonster)