Nina makes 8 origami frogs in 36 minutes. at that rate, how many origami frogs can she make in 90 minutes?

20 origami frogs.

Step-by-step explanation: This is simple proportion problem

Number of origami frogs made in 36 minutes = 8

Therefore we first need to solve for number of origami frog Nina can made in 1 minute

                                                                       36 minutes = 8

                                                                       1 minute      = 8/36

                                                                                           = 2/9 origami frogs  

Therefore, in 90 minutes , Nina will make                       = 2/9 × 90/1

                                                                                           = 20 origami frogs.

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