• 5 months ago
This question is of D-2
Transcript
00:00This is a question related to the topic of Direct and Inverse Proportions.
00:08In this question 3x4 of a piece of metal has a mass of 15 kgs.
00:15We have to find what is the mass of 2x5 of the same piece of metal.
00:22First of all we will suppose that the mass of 2x5 of the piece of metal is x kgs.
00:28We will take x for the quantity which is unknown to us.
00:33These two quantities will be on the one side of equation and the two known quantities will
00:39be on the other side of equation.
00:425 is going to multiply by x and this 4 is going to multiply by 15.
00:49So what we get is 5x by 2, 60 divided by 3.
00:56Now we will do cross multiplication.
00:58So 5x will be multiplied by 3 and this 2 is going to multiply by 60.
01:0515x is equal to 20.
01:09Now we have to find x.
01:10We have to find x that's why we will isolate x, we will separate x from the other quantities.
01:1515 is multiplying here.
01:17When it will go to the other side of equation it will divide.
01:21As a result what we get is x and that is 8.
01:25So mass of 2x5 of the piece of metal is 8 kgs.