Latest TCS Aptitude Question SOLUTION: A child buy 18 pencil and pay 100 rs. He pay 1 rs more for white pencil than brown pencil. How many white pencil He buy? and what is price of one white pencil

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A child buy 18 pencil and pay 100 rs. He pay 1 rs more for white pencil than brown pencil. How many white pencil He buy? and what is price of one white pencil

Asked In TCS koushik singha (9 years ago)

Solved Argha Banerjee Read Solution (10)

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Read Solution (10) :

shubhank`  (9 years ago)

How come you know that white pencils are 10 and brown are 8?
Please explain.

Is this solution Helpfull? Yes (15) | No   

BIKRAM TAPADAR  (9 years ago)

LET white pencil be x and brown be 18-x
let 1 brown pencil be y rs.

so, x(y+1)+(18-x)y=100
=>xy+x+18y-xy=100
=>x+18y=100
x=10 y=5

ans : 6

Is this solution Helpfull? Yes (10) | No (3)  

Sambit S. Mondal  (9 years ago)

As 18 pencils cost Rs-100 first divide 100 by 18
ie. 100/18 = which will be 5.5555555
So Brown must be less than this value & white must be greater than this value.
So brown is Rs 5 per pencil & White is Rs 6 per pencil
So you have X+y = 18
& 5x +6y = 100
which gives 10 Whites 8 Browns with 6 & 5 rupee respectively.

Is this solution Helpfull? Yes (8) | No   

Argha Banerjee  (9 years ago) Best Solution

let cost of brown pencil be Rs. x and that of white pencil be Rs. (x+1)
c.p of white pencil+c.p of brown pencil=100
=>10(x+1)+8x=100
=>18x=90
so,x=5

white pencil=10(x+1)=60
brown pencil=8x=40

Is this solution Helpfull? Yes (5) | No (15)  

VIKASH KUMAR  (9 years ago)

Let white pencil be y and brown be 18-y
let 1 black pencil be x rs. Nd 1 white pencil be rs (x+1)

so, yx + (18-y)(x+1)=100
=>18(x+1) - y=100

now ,,here think about of the 100 , how can u break the 100 so that
One part will be the multiple of 18 nd it will be greater than 100 ..
=18*6 - 8

so.(x+1)=6 and y=8
(x+1)=6
So, x=5
Nd total number of black pencil =y =8 nd white =x=(18-y)= 10

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Swapnil Singh  (9 years ago)

cost of white pencil =rs 60
cost of brown pencil=rs 40

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Swapnil Singh  (9 years ago)

10 white pencil and cost of each is rs 6

Is this solution Helpfull? Yes (2) | No (1)  

vinay kumar singh  (9 years ago)

price of one white pencil=RS.6,no of white pencil=10,cost=10*6=60
price of brown pencil=Rs 5,no of brown pencil=8,cost=8*5=40

Is this solution Helpfull? Yes (2) | No (1)  

Rishabh Jain  (9 years ago)

same question like shubhank

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harika  (9 years ago)

how u got to know white pencils are 10 and brown are 8 ?

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