Question

What is method for 23rd question?

Answer 1

Heyaa...☺

It is simple subtraction and addition method. None other method is used in it.

Thanks..☺

Answer 2

it is given that tanker has 4/5 oil in it
let the no. of bottles be x
oil of bottles in tanker=(4/5)×x
now it is given when 6 bottles are removed and 4 are added then tanker has (3/4)x
so we get

(4/5)x-(6-4) =(3/4)x
4x/5 -2=3x/4
4x/5-3x/4=2
(16x-15x)/20=2
x/20=2
therefore x=20×2=40

hope it helps if it does pls mark as brainliest