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 By: Kerjora (offline)  Sunday, December 13 2015 @ 06:26 AM CST (Read 648 times)
Kerjora

Can any one help me with this question?
_____________________________________________________________
1 bag and 2 pencil boxes cost \$d.
2 bags, 4 pencil boxes and 4 erasers cost \$28.

(a) How much does one eraser cost? Express your answer in terms of d.
(b) If d=13, find the cost of an eraser.

Be Postive

Newbie

Registered: 08/27/12
Posts: 7

 By: echeewh (offline)  Sunday, December 13 2015 @ 10:31 PM CST
echeewh

Hey <Kerjora>,

Following pls find my worked solution:

(a)
B + 2P = d -- (1)
2B + 4P + 4E = 28 -- (2)

(1)x2:
2B + 4P = 2d -- (3)

Substitute/ replace (3) in (2):
2d + 4E = 28
4E = 28 - 2d
E = \$ [(28 - 2d)/4] = \$ (7 - d/2)

(b)
If d = 13,

E = \$ (7 - 13/2) = \$ (1/2) = \$0.50

======

Trust this helps.

Do let me know again if this is different from your <anskey> or if there's further clarification.

Cheers,
Edward

Active Member

Registered: 04/21/11
Posts: 625

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