6:16::20:?::11:81
find ? value
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Answer:
Step-by-step explanation:
Either one of two patterns are followed here. One pattern is the squaring of a series of numbers.
4²=16, 5²=25, 6²=36, 7²=49, 8²=64, 9²=81
Another would be a sequence of consecutive odd numbers getting added to the previous.
25–16=9
36–25=11
49–36=13
64–49=15
81–64=17
If you wish to find the one before 16, you can either subtract 2 from the difference between your two smallest values 16 and 25: 7.
16–7=9
Given that 4² equals the first number given, the one processing this can be retrieved by squaring 3.
3²=9
The same can be done if you wish to get the value following 81.
81–64=17
17+2=19
81+19=100
Or...
9²=81
9+1=10
10²=100
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