Question

(1) How many paise does a matchbox cost? _______
(2) How many matchboxes can be got for Rs 2.50? _______
(3) How many rupees does the soap cost? ______
(4) Arun wanted to buy a soap. He has a five-rupee coin, 2 one-rupee coins and 4 half-rupee coins. Write in rupees what money he will get back.
(5 a) An egg costs two and a half rupees. How much will one and a half dozen cost?
(b) How many pens can Kannan buy? How much money is left?
(6) The price of two pens is Rs ______. Can she buy two pens?

Answer 1

We know that,
Re 1 = 100 paise

(1) Cost of a matchbox = Re 0.50
= 50 paise

(2) Cost of a matchbox = Rs 50 paise
Amount of money to buy matchboxes = Rs 2.50
= 2 rupees 50 paise
= 2 × 100 paise + 50 paise
= 200 paise + 50 paise
= 250 paise

So, number of matchboxes bought for Rs 2.50 = 250 ÷ 50
= 5
Thus, 5 matchboxes can be bought for Rs 2.50.

(3) Cost of a soap = Rs 8.75

(4) We know that,
Re 1 = 100 paise
Arun has a five-rupee coin, 2 one-rupee coins and 4 half-rupee coins.
Now,
Rs 5 = 5 × 100 paise
= 500 paise

2 one rupee coins = 2 × 100 paise
= 200 paise
4 half-rupee coins = 4 × 50 paise
= 200 paise
Total money with Arun = 500 paise + 200 paise + 200 paise
= 900 paise

Cost of a soap = Rs 8.75
= 8 rupees 75 paise
= 8 × 100 paise + 75 paise
= 800 paise + 75 paise
= 875 paise

Money left with Arun after buying a soap = 900 paise − 875 paise
= 25 paise
= Rs 0.25

$\begin{array}{cccc}& 9& 0& 0\\ -& 8& 7& 5\\ & 0& 2& 5\\ & & & \end{array}$

Thus, after buying a soap, Arun will get back Rs 0.25.

(5)
(a) Cost of an egg = Rs 2.50
= 2 rupees 50 paise
= 2 × 100 paise + 50 paise
= 200 paise + 50 paise
= 250 paise

Now, one dozen eggs = 12 eggs
So, one and a half dozen eggs = 12 + 6
= 18 eggs

Cost of 18 eggs = 18 × 250 paise
= 4500 paise
= Rs 45




Thus, cost of one and half a dozen eggs is Rs 45.

(b) Total money with Kannan = Rs 60
Cost of one and a half dozen eggs = Rs 45
Total money left with Kannan after buying eggs = Rs 60 − 45
= Rs 15
= 1500 paise

Now, Kannan uses the money that is left for purchasing pens.
Cost of a pen = Rs 6.50
= 6 rupees 50 paise
= 6 × 100 paise + 50 paise
= 600 paise + 50 paise
= 650 paise

Cost of 2 pens = 2 × 650 paise
= 1300 paise
= Rs 13

So, Kannan can buy only two pens with the amount of money that was left with him after purchasing eggs.
Now, money left with Kannan after purchasing pens = 1500 paise − 1300 paise
= 200 paise
= Rs 2
Thus, Kannan was left with Rs 2 after buying 2 pens.

(6) The price of two pens is Rs 13.
She can buy two pens.