If 10 subtracted from half of a number, the result is 4.

Soln:- let the any number=x 

According to Question, 

⇒(x/2) - 10=4

⇒(x-20)/2 =4

⇒x-20=8

⇒x=28

Hence this number is 28.

A number when subtracted from 30 results in 15 this statement in the form of an equation is

Soln:- let the number =x

According to question, 

⇒30-x=15

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