Tom went to buy apple in the grocery store. He would be short of $3.50 if he wanted to buy 5kg apple. Instead, he bought 4 kg apple. The casher gave $1.50 back at the checkout. How much did Tom have at the beginning?
For solution, please watch the video https://youtu.be/rgqKiu4tovE
David and Max want to buy a notebook. However, David is short of $3.20 and Max is short of $2.7. If David and Max combine their money, they can buy exactly one notebook. How much is the notebook?
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