Question

if the cost of 20 books is Rs 189,how much will 15 books cost?​

Answer 1

Answer:

Cost of one book=189/20

cost of 15 books=189×15/20

=189×3/4

=47.25×3

=141.75Rs.

Answer 2

Answer:

kindly see the answer below...

Step-by-step explanation:

Here,

if the cost of 20 books is Rs 189

then,

$20 \: books \: cost \: 189 \: rupees$

$so \: 1 \: book \: cost \: \frac{189}{20} rupees$

$= 9.45 \: rupees$

therefore,

$the \: cost \: of \: 15 \: such \: book \: is \: 15 \times 9.45$

$= 141.75 \: rupees$

this is the required answer..

thanks a lot..