Rohan keeps a total of 90 guppies in 4 fish tanks. There is 1 more guppy in the 2nd tank than the 1st tank. There are 2 more guppies in the 3rd tank than the 2nd tank. There are 3 more guppies in the 4th tank than the 3rd tank. How many guppies are in the 4th tank?
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