Tank P contains 3 times as much water as Tank Q. How much water must be transfer from Tank P to Tank Q so that each tank contains 30 litres of water?
A30 litres
B20 litres
C15 litres
D25 litres
Ans 2:
Class : Class 7
C is the answer as:-
Assume that tank p as x and tank q as y.
We know that:-
X=3y
X+y=60 litres
And the question is:-
What is the value of x if x=3y and x +y =60 ?
It is 15 as x+y =4x and 4x=60 and x=60/4= 15
So,15 litres should be poured from tank p to tank q.