cost of 6 pens and that of 1 book are same. The cost of 72 pens and 9 books is equal to the cost of

M4maths Previous Puzzles

23 Mar 2011 Book and pen

cost of 6 pens and that of 1 book are same. The cost of 72 pens and 9 books is equal to the cost of x books

OPtion

1) 15
2) 16
3) 17
4) 18
5) 19
6) 20
7) 21
8) 22
9) 23
10) 24

Solution

72 pens = 12 books
and 12 + 9 = 21 books

Correct Option: 7 Best Solution (14)

Karthick Babu   13 years AGO

6 pen=1 book
1 pen=1/6 book
72 pen =72 * (1/6) book
=12 book
Question:
72 pen +9 book=12 book +9 book
=21 book
So,Option 7

Like? Yes (4) | No (1)  

YadeeshKumar   13 years AGO

6p=1b
72p+9b=x
72p+54p=x
126p=x
it is equal to 21 books cost

Like? Yes (4) | No (1)  

Suresh Varma P   13 years AGO

12 + 9 = 21 books

Ans: Option 7

Like? Yes (3) | No   

Gunaseelan   13 years AGO

6p=1b;
Given 72p+9b=12b+9b=21b

Like? Yes (3) | No   

Nitin Awasthi   13 years AGO

72P + 9B = x
(6*12)P + 9B = x
12B + 9B = x
x = 21B

Like? Yes (2) | No   

ULAGUNATHAN   13 years AGO

one pen = 1/6of book
i.e, 72pen+9book = x books
72/6 books +9 books = x books
21 books = x books
so x = 21

Like? Yes (2) | No   

GovindhaRajan   13 years AGO

6 pens = 1 book that is (6rs)
72 pens=12 book and 9 books total=21

Like? Yes (3) | No (1)  

A J V   13 years AGO

6pens = 1 book.
72p + 9b
=12(6p) + 9b
= 12(b) + 9b
= 21 books.

Like? Yes (2) | No   

krishna kumar gupta   13 years AGO

let cost of one book=10 rs;
then cost of 6 pens=10;
so cost of one pen=10/6;

by question---
72*(10/6)+10*9=210
so number of books=210/10=21;

Like? Yes (1) | No   

Murthy Ch.v.v.s.s.s.   13 years AGO

given 6p=b; i.e p=b/6;
so 72p+9b=72(b/6)+9b=21b;
so option :7 is correct.

Like? Yes (1) | No   

Amit Kumar   13 years AGO

cost of 6pen=1book
so cast of 1pen=1/6book
so cast of 72pen=12books
accrding ti question
12books+9books=x
so x=21books

Like? Yes (1) | No   

Balakumaran N.A   13 years AGO

let us consider 1book=Rs.6 then 6pen=Rs.6 are equal.
72(1)+9(6)=126 (cost of x books)...

Therefore x=21 books.

Like? Yes (2) | No (1)  

Sneha Latha M   13 years AGO

the cost of 1 book = the cost of 6 pens
the cost of 72 pens=12 books
so The cost of 72 pens and 9 books = 12 books + 9 Books= 21 books

Like? Yes (2) | No (1)  

suneelkumar.avvari   13 years AGO

cost of 72 pens = 12 books
o total books = 12+9 =21

Like? Yes (1) | No