Question

If 10,30,20,x,50,150,y then find y minus x

Answer 1

x=60
y=100
y-x=40
answer is 40

Answer 2

Explanation:

Here value of x=60 because 10*3=30 and 20*3=60, so x=60. Similarly, for finding the value of y, we see a pattern. 30-20=10. Again, if x=60, then 60-50 is also 10. So, y should be 10 less than 150 which is 140. Therefore, y-x=140-60=80. Series : 10, 30, 20, X, 50, 150, Y.

This is a mixture of two series.

Series 1 : 10, 20, 50, Y

Series 2 : 30, X, 150.

And both series have different logic.

Start with Series 1.

Series 1 : 10, 20, 50, Y

Diff :          +10, +30, ?          

So, When we check their is different of +20 in between 10 and 30. So, different between next next and 30 is also +20.

? = 30 + 20 = 50

So, Y = 50 + 50

Y = 100.

Now,

Series 2.

Series 2 : 30, X, 150.

Different between 30 and 150 is +120. so just divide 120 into 2 parts. Each part have +60.

So,

X = 30 + 60

X = 90.                                   #(90 + 60 = 150(Next term))