Question

18,22,30,?,78,142 find the missing number
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Answer 1

Answer:

18+4=22

22+8=30

30+16=46

46+32=78

78+64=242

your answer=46.

Answer 2

Given:

A series of numbers 18, 22, 30,? , 78, 142.

To Find:

The number which replaces the ? will be ?

Solution:

The unknown number can be found by developing a common logic between every number.

1. The given series is 18, 22, 30,? , 78, 142.

2. The second number in the series is obtained using the logic,

=> 22 = 18 + 4,

3. The third number in the series is obtained using the logic,

=> 30 = 22 + 8,

4. The sixth number in the series is obtained using the logic,

=> 142 = 78 + 64,

=> The fourth number in the series is obtained by adding 16 to the previous number as every term in the series is increasing on a scale of 4, 8, 16, 32, 64.

=> Fourth term = 30 + 16,

=> Fourth term = 46.

5. The fifth number in the series is obtained using the logic,

=> 78 = 46 + 32.

Hence, the number 46 satisfies the logic used for all the terms.

Therefore, the missing number is 46.