Rohan keeps a total of 90 guppies in 4 fish tanks. •There is 1 more guppy in the 2nd2nd tank than in the 1st1st tank. •There are 2 more guppies in the 3rd3rd tank than in the 2nd2nd tank. •There are 3 more guppies in the 4th4th tank than in the 3rd3rd tank. How many guppies are in the 4th4th tank?
A. 20
B. 21
C. 23
D. 24
E. 26

Sum-difference-multiple problems中文
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E. 26

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