Question

: The cost of 10 notebooks is rs.300 Find the number of notebooks that can be purchased with 420 Rs.Find the cost of 5 notebooks​

Answer 1

Answer:

Cost of 1 notebook = 300/10 = ₹30

No. of notebooks in ₹420 = ₹420/₹30 = 14 notebooks

Cost of 5 notebooks = ₹30×5 = ₹150

Answer 2

Answer:

$\sf \: Find \: the \: number \: of \: notebooks \: that \: can \: be \: purchased \: \\ \sf \: with \: 420 \: Rs \: = \: \red{14}$

$\sf \: cost \: of \: 5 \: notebooks \: = \green{150}$

Step-by-step explanation:

$\sf \: cost \: of \: 10 \: notebooks \: = \green{ruppes \: 300}$

$\sf \: cost \: of \: one \: notebook \: = \frac{300}{10}$

${}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{} \implies \cancel\frac{300} {10} {}^{30}$

$\sf \: \implies \: 30 \: ruppess$

$\sf \: notebooks \: can \: be \: purchased \: from \: \: ruppes \: 420 \:$

$\implies \: \cancel\frac{420}{30} {}^{14}$

$\sf \implies \boxed{ \sf \green{\large14 \: notebooks}}$

$\sf \red{Cost \: of \: 5 \: Notebooks}$

$\sf \: \implies \: 30 \times 5$

$\large \boxed {\underline{ \green{150}}}$