Planet of Thinking
IMPLEMENTATION, VIDEO-LESSONS


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22.

On Sunday a kind little hippopotamus decided to take frogs on a ride. At first some frogs jumped on his back. On the way near the lily pads 6 more passengers joined them. On reaching the shore, the little hippopotamus said good-bye to 8 frogs, and 7 frogs remained on his back. How many frogs jumped on his back at first?


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