Question

a pencil box contains 2 pens that cost Rs A, 2 pencils that cost Rs B and an eraser that cost Rs C. If the cost of the pencil box is Rs D, find the total cost of (2a+b) pencil boxes.

Answer 1

2pens = rs a.
2 pencils = rs b
eraser =rs c
total of pencils box = rs d
find , (2a +b)= ?

total of box. d=a+b+c
2pens=a.
and if 4pens =a+a=2a

so add both sides 2pens
d+a=a+b+c+a
d+a=2a+b+c
(d+a)-c=(2a+b)

total cost of (2a+b) pencil box is rs (d+a)-c

Answer 2

Answer:

Total cost of $(2a+b)$ pencil box is $Rs(d+a)-c.$

Step-by-step explanation:

$2$ pens $=Rs$ $a$

$2$ pencils $=Rs$ $b$

Eraser $=Rs$ $c$

Total of pencils box $=Rs$ $d$

Find: $(2a+b)=?$

total of box $d=a+b+c$

$2pens=a$

and if $4$ pens $=a+a=2a$

So add both sides $2$ pens

$d+a=a+b+c+a\\d+a=2a+b+c\\(d+a)-c=(2a+b)$

Total cost of $(2a+b)$ pencil box is $Rs(d+a)-c.$

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