Brain Training "Missing Number"

[aushy]

Another vote for 90.

[Waah954]

Yeah i can only see one trend. 90

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[foursite12]

90 is all I can come up with but it feels too obvious.

[Philski]

15. Has to be.

[sengjc]

90

[Fugu]

2+9^2*10-2*370+18

order of operations....

[helix]

Let's have it......................

[Optic101]

For this one 90 is the correct answer!

[jsd]

For this one 90 is the correct answer!

Now I see how it's 90. I still think that 15 could be a logical answer as well.