Rich math task and problem solving task

Here are the awnseres for my rich math and problem solving tasks

The question  is if you have 600ML jar 1/3 full of water if you pour all that water into a 300ML jar how full is the 300ML jar The awnser is the 300ML jar will be half full of water

The other one is if mary has a $5 dollar note she exchanged it for six coins what coins does mary get

She gets 2 50 cent coins and 4 one dollar coins

 

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