1.

120, 80,40,45,?,5 missing term

Answer»

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.


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