The kind brought some fresh water and gave to him( future continuous tense)​

We have, 4× first part =5× second part

=7× third part =x(say)

According to question,

4

x

+

5

x

+

7

x

=1162

⇒

140

35x+28x+20x

=1162

⇒83x=1162×140⇒x=

83

1162×140

=1960

∴ First part =

4

1960

=490

Second part =

5

1960

=392

Third part =

7

1960

=280.