Can you tell what will be the sum of the fourth row ?
i.e. Sum of Burger + Beer Bottle * Beer Mug ?
obviously you have to apply some mathematics here, question is how fast you can solve it.
Check your answer:- See Answer and Solution
If you see there are 3 variables and 3 equations, we can solve the equations and get the variables values and than we can find the value of fourth equation.
From the first equation we can say that Beer Bottle = 10
than from the second Burger = (20 – 10)/2 = 5
and from the third equation Beer Mug = (9 – 5)/4 = 1
Thus Burger + Beer Mug * Beer Bottle = 5 + 1*10 = 15
here as per BODMAS 5 + 1*10 will be 5 + 10 and not 6*10