I don't understand how to do the math problem. Please help. I need help with the math. I know its a problem though.

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Rebecca has 21 math problems to solve. She has solved 2/7 of them. How many problems has she solved?

I don't understand how to do the math problem. Please help. I need help with the math. I know its a problem though.

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you split $1500 between two savings accounts. one pays 4% interest and the other pays 5%. after one year, you have earned $69.50 in interest. How much was in the 4% account? ...

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Please help

Round to nearest dollar

I have tried to do this question and I just dont understand it at all