Question

6,8,10,12,16,20,15,_,25 what is the missing number with clear explanation

Answer 1

Answer:

Explanation:

*its a pattern*

20 because in first four are difference of 2 numbers in second two 2 numbers and un last three there is a difference of 5 numbers

20+5=25

Answer 2

Given : 6,8,10,12,16,20,15,_,25

To Find : what is the missing number

Solution:

6,8,10,12,16,20,15,_,25

group of 3

( 6 , 8 , 10 ) , ( 12 , 16 , 20 ) , ( 15 ,  x , 25)

6² + 8 ² = 10²

12² + 16² = 20²

15² + x² = 25²

=> x² =25² - 15²

=> x² = (25 + 15)(25 - 15)

=> x² = 40 (10)

=> x² = 400

=> x = 20

Hence missing number = 20

Another logic

6 , 8 , 10

(6 + 10)/2 = 8

12 , 16 , 20

(12 + 20)/2 = 16

(15 + 25)/2 = x

=> 20 = x

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