Question

120, 80.40.45. ? 15​

Answer 1

30 is ur answer

Step-by-step explanation:

30

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Answer 2

Answer : 25  

Step-by-step explanation:

Given, 120 , 80 , 40 , 45 , ? , 5  

this series is the combination of two different series .e.g., 120, 80 , 40 and 45, ? , 5

here in 120, 80, 40 are in AP where common difference is -40.

so, 45 , ? , 5 should be arithmetic progression.  

we know, difference between two consecutive terms of arithmetic progression always remains same.

Let unknown number is x.

then, x - 45 = 5 - x  

or, x + x = 45 + 5  

or, 2x = 50

or, x = 25  

hence, required answer is 25.