Question

the cost of 5 pens is 21 rupred less than the cost of 4 books if the cost of a book is 24 rupees,find the cost of a pen

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Answer 1

Answer:

15 Rupees

Step-by-step explanation:

Let x:- cost of a pen

y:- cost of a book

Then a/c to the ques:-

5x=4y-21

& y=24

Therefore 5x=4(24)-21

5x=96-21=75

Therefore x=15 rupees

Answer 2

Answer:

Each pen cost Rs.15

Step-by-step explanation:

GIVEN:-

• The cost of 5 pens is Rs.21 less than the cost of 4 books.
• The cost of a book is Rs.24.

SOLUTION:-

$\bold{\boxed{COST_{4books}=24×4=96}}$

Let,Cost of a pen be 'x'

$\bold{\boxed{5(COST_{pen})=COST_{4books}-21}}$

$5(x)=96-21$

$5(x)=75$

$\color{red}{\bold{\boxed{x=15}}}$