Question

20, 21, 42, 14, 18, ? 15

Answer 1

Given  : 20, 21, 42, 14, 18, ? 15

To Find : Missing number

Solution:

20

20 + 1   = 21

21  ×  2  = 42

42 ÷  3  = 14

14  + 4   = 18

18 ×  5  = 90

90 ÷ 6  = 15

So missing number is   90

operations in sequence are + ,  × ,  ÷  

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Fill in the blank with suitable number in the following sequence :100 ...

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Answer 2

Step-by-step explanation:

1. 20+1=21

2. 21×2=42

3. 42÷3=14

4. 14+4=18

5. 18×5=90

6. 90÷6=15

Simple!