JEE Main 20 July 2021 Shift 1 Solved Paper

A steel block of 10kg rests on a horizontal floor as shown. When three iron cylinders are placed on it as shown, the block and cylinders go down with an acceleration 0.2m∕s2. The normal reaction R′ by the floor if mass of the iron cylinders are equal and of 20kg each, is ______ N. [Take g=10m∕s2 andµs=0.2]