Question

what is the trick to solve question 17 9 10 ? 35 90

Answer 1

(17+1)(1/2)=9
(9+1)(2/2)=10
(10+1)(3/2)=16.5

16.5 is the ans ..

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Answer 2

16.5 is the missing number in 17 9 10 ? 35 90

Given:

17 9 10 ? 35 90

To find:

Missing number = ?

Solution:

To find the missing number we first check the difference between the numbers the first number is  

17 – 9 = 8

9 – 10 = -1

10 – ? = xx

35 – 90 = -55

As we can see that there is no matching pattern in the difference we check if the numbers have geometric pattern to them

If 17 is added to 0.5 and multiplied by 0.5 then we get the value of 9

Let us try this method for the second number as well we get $(9 + 1 )\times 1=10$

Similarly for 35 we take$35 \times 2.5 = 87.5 + 2.5 = 90$

Hence, the third number is $10 \times 1.5 + 1.5 = 16.5$

Therefore, the missing number is 16.5.