Write a realistic problem that could be answered by using the following expression: 4*3+5*7.

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I went to a store with my friends. There were ten of them. I promised them to buy gifts for each one of them. For three girls, I bought them a _____ each which cost me 4 dollars each. For 7 boys, I bought ______ for each one of them which cost 5 dollars each. I much did I have to pay in total?

There's this fish named Bob who has a friend named Sally. Bob goes and finds four bundles of fish food with three packages each. Sally finds 5 beautiful bags containing 7 sapphires each. If bob gave sally his findings, how many findings would Sally have?