Divide 830 into t

Let the two parts be x and y such that

x+y=830…..(i)

So y=830-x

So the two parts will be x and (830-x)

Now according to the given criteria,

30% of x=40% of (830-x) +4

⇒ 3x=4(830-x)+40

⇒ 3x=3320-4x+40

⇒ 3x+4x=3360

⇒ 7x=3360

So the other part is 830-x=830-480=350

Hence the two parts are 480 and 350.