Basic Counting Number

Natural, Whole, Odd, Even, Prime numbers etc.

Problem type 1

Ram started his journey by walking for one hour, then took a bus for three hours then again started walking for an hour. How long was his journey?

Ram walked for one hour in the beginning & one hour in end.

So, he walked for two (2) hours.

He also took a bus for three (3) hours.

By adding 2 & 3, gives 5.

So, his journey was 5 (1+3+1) hour long.

Problem type 2

Mother kunti asked arjuna to order grocery on an online e-commerce platform with a budget of 1000 rupees. The grocery list contains the following:

• 3 Litre of oil (1L costs 100 Rupees Or 100 Rs per a litre)
• 2 litre of milk (50 Rs/Litre)
• One dozen egg (15 Rs/egg)
• A packet of soyabean (120 Rs/pack)

She also told arjuna, he can order an ice-cream for him if there is money left. Can arjuna have his ice-cream ?

Arjuna has 1000 rs in the beginning.

Then, he orders 3L oil. Costing: $3 \times 100= 300$ rs.

Now, he has 1000-300 = 700 Rupees left.

Then, he orders 2L of milk. Costing: $2 \times 50 = 100$ rs.

Now, he has 700-100 = 600 Rupees left.

Then, he orders 12 (one dozen) eggs.
Costing: $12 \times 15 = (10 + 2) \times 15 = (10 \times 15) + (2 \times 15) = 150 + 30 = 180$ rs.

Now, he has 600-180 = 420 Rupees left.

Then, he orders a pack of soyabean. Costing: 120 rs.

Now, he has 420-120 = 300 Rupees left.

So, yes Arjuna can & will order an icecream 🍦🥳.

Problem type 3.

Mother sita went to a mall to shop grocery, she noticed there was a discount for chocolate bar combos. So, she decided she'll buy a chocobar combo as her both child(Lob & Kush) loves chocolate bar. There were four type of combos each containing 3,7,13 & 16 chocolate bar respectively.

Which combos should she buy, so that each of her child will have equal number of chocolate bar?

As 3, 7, 13 are all odd numbers, they are not divisible by two.

But 16 is a even number & divisible by two.

So in order to distribute equal number of chocobar, she should buy the chocobar combo of 16.

Problem type 4.

Uncle Bhisma wanted to buy mangos for his three nephews (Dhritrastra, Pandu & Bidhur). He was in a hurry, so he had to pick between three packs each containing 19,21,23 mangos respectively. Which pack should he buy in order to equally distribute mangos among his nephews ?

Which combos should she buy, so that each of her child will have equal number of chocolate bar?

As 19 & 13 are prime numbers, they are not divisible by three.

But 21 is not a prime number & divisible by three.

So in order to distribute equal number of mangos, he should buy the mango pack of 21.