Explanation

There are n cows: 
First son gets: 2n​

Second son gets: 4n​

Third son gets: 5n​

Fourth son gets: 7 cows

Therefore, sum of cows each son gets equals the total number of cows
2n​+4n​+5n​+7=n
7=20n​
n=140

Explanation

x + 5x + 10x = 640

16x = 640

x = 40

∴ no. of notes = 40×3=120

Explanation

Let A be the amount of type of first rice and

B be the Amount of second type of rice

According to question:  A + B = 50 Kg

Also

                           A  x 4.5 + B x 5 = 240 Rs

Thus solving the above two equations

                    (50 – B) x 4.5 + 5B = 240

                       225 – 4.5 B + 5B = 240

                                          0.5 B = 15

                                                 B = 15/ 0.5

                                                 B = 30 Kg

                                        Thus A = 50 – 30 = 20 Kg

Explanation

1163​=1619​  Its reciprocal=1916​
∴ Required difference=1619​−1916​
=304361−256​=304105​

Explanation

Explanation

The given sentence is an example of an optative sentence which expresses hope, prayer or wish. Following rules are followed to change the direct speech of such sentences:

If the reported speech starts with 'may', then the reporting verb 'said' is replaced with word 'prayed'.

The sentence becomes an assertive sentence.

The exclamation mark is omitted. 

The sentence would become - She prayed for a long life for him. 

Thus, option C is the correct answer according to the rules. 

Explanation

Present indefinite change into past indefinite 

Explanation

Explanation

Explanation