[mai thÃÂ] [BÃmáºtcá»§atìnhyêu] [闪亮的日å] [Ava has some pennies and some nickels. She has at most 20 coins worth a minimum of $0.48 combined. If Ava has 7 pennies, determine the minimum number of nickels that she could have.] [ì´ì„¸ëŒ 팬 스텔 팬 싸우는 ì´ìœ ] [mã´i træ°á»�ng vã] [ôn thi toán] [Ä ắk Nông] [cuá»™c cã¡ch mạng] [hồ tây]