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 By: mypostbox1 (offline)  Saturday, October 29 2011 @ 02:39 AM CDT (Read 1622 times)
mypostbox1

3 notebooks and 2 pens cost \$19
4 notebooks and 3 pens cost \$26
a) find the cost of a notebook
b) If Siti has only \$30 to buy 3 notebooks and some pens, what is the maximum number of pens she buy?

Newbie

Registered: 10/28/11
Posts: 2

 By: sokechan (offline)  Saturday, October 29 2011 @ 03:05 AM CDT
sokechan

3 notebooks + 2 pens = \$19
4 notebooks + 3 pens = \$26
---------------------------------------
9 notebooks + 6 pens = \$57
8 notebooks + 6 pens = \$52
---------------------------------------
1 notebook = \$5

a) A notebook costs \$5.

3 notebooks = \$15
2 pens = \$19 - \$15
= \$4
1 pen = \$2
\$30 - \$15 = \$15
\$15 / 2 = 7 Remainder 1

b) The maximum number of pens is 7.

Junior

Registered: 02/25/11
Posts: 23

 By: mypostbox1 (offline)  Saturday, October 29 2011 @ 04:11 AM CDT
mypostbox1

thank you & now I understand.

Newbie

Registered: 10/28/11
Posts: 2

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