Laws of Motion Part 1

A hanging mass M is connected to a four times bigger mass by using a string-pulley arrangement, as shown in the figure. The bigger mass is placed on a horizontal ice-slab and being pulled by 2‌Mg force. ln this situation, tension in the string is ‌

x

5

‌Mg for x= ____. Neglect mass of the string and friction of the block (bigger mass) with ice slab.
(Given g= acceleration due to gravity)