Question

and its tributaries
Que. I (A) Fill in the blanks.
1. The carefully preserved bodies are known as
2. Some of the earliest cities developed on the banks of river
3. Places where stone was found and where people made tools are known as
and​

Answer 1

Answer:

a mummies

b varanasi

c cave

Explanation:

are answers helpful

Answer 2

Explanation:

Requiredanswer:

A situation is given, where when a natural number when increased by 12 equals to 160 times of its reciprocal.

Let, the natural number be x. Then, the reciprocal of the number is 1/x. ATQ,

Natural no. increased by 12 = x + 12

160 times of its reciprocal = 160/x

⇛ x + 12 = 160/x

Cross multiplying,

⇛ x(x + 12) = 160

⇛ x² + 12x = 160

⇛ x² + 12x - 160 = 0

Factorising the above by middle term factorisation,

⇛ x² + 20x - 8x - 160 = 0

⇛ x(x + 20) - 8(x + 20) = 0

⇛ (x + 20)(x - 8) = 0

Then, x = -20 and 8

As it is a natural number, it can't be a negative number i.e. -20.

\therefore∴ So, the number is 8

And we are done !!