optimum amount of homework

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1. The perfect amount of homework is just one hour per day

   

2. What's the optimum amount of homework to set a teenager?

   

3. What's the optimum amount of homework to set a teenager?

   

4. How much time do you spend doing your homework

   

5. The Countries Where Kids Spend The Most Time Doing Their Homework

   

6. Jonathan graph on emaze