Question

a pen and note book cost 720 together. four pens cost the same as five note book. find the cost of each
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Answer 1

Answer:

a pen and note book cost 720 together. four pens cost the same as five note book. find the cost of each

Answer 2

cost of 1 pen = ₹400

cost of 1 Notebook = ₹320

Step-by-step explanation:

cost of 1 pen = x

cost of 1 Notebook = y

According to statement

four pens cost = cost of five note book

4x = 5y

$x = \frac{5y}{4}$

a pen and note book cost 720 together

x + y =720

$\frac{5y}{4} + y = 720$

$\frac{9y}{4} = 720$

$y = \frac{720 \times 4}{9}$

$y = 80 \times 4$

y = 320

Now,

x + 320 = 720

x= 400

therefore x = ₹400, y = ₹320