Solution
In each row, the number in the middle is the arithmetic mean of the other two.
Eg = $$\frac{110+90}{2}=\frac{200}{2}=100$$
and $$\frac{80+40}{2}=\frac{120}{2}=60$$
Similarly, $$\frac{150+x}{2}=120$$
=> $$150+x=240$$
=> $$x=240-150=90$$
=> Ans - (D)
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