Explanation

Brahmagupta, an astronomer and mathematician from India used zero in mathematical operations like addition and subtraction.

Aryabhatta introduced zero in 5th century.

Brahmagupta introduced zero in calculations in around 628 AD.

Explanation

Days in which 40 cows eat 40 bags of husk = 40 days

Days in which 1 cow eat 40 bags of husk = 40 * 40 days

Days in which 1 cow eat 1 bag of husk = (40 * 40) / 40 bags

In a dairy form 40 cows eat 40 bags of husk in 40 days, In 40 days one cow will eat one bag of husk

Explanation

729 = 27 × 27

√729 = √(27 × 27)

√729 = 27

Explanation

Average of prime numbers between 30 to 50 will be

31 + 37 + 41 + 43 + 47/5

 =

199/5

 = 39.8

Explanation

• 30% of 100 = 30
• 3% of 1000 = 3/100 × 1000 = 30
• So, 30% of 100 is equal to 3% of 1000.