Question

120,80,40,45,?,5. ___​

Answer 1

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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