 
 <translate> Let X be the number of children in the group. The number of adults in the group is X + 25. The group pays 8 * X + 15 * (X + 25) = $720. Multiplying through the parentheses, we get 8X + 15X + 375 = $720. Combining like terms, we get 23X + 375 = 720. Subtracting 375 from both sides, we get 23X = 720 - 375 = $345. Dividing both sides by 23, we get X = $345 / 23 = 15 children. The final answer: 15. <hau> Bari X ya zama adadin yara a cikin rukuni. Adadin manya a cikin rukuni shine X + 25. Ƙungiyar ta biya 8 * X + 15 * (X + 25) = $720. Ta hanyar ninkawa ta hanyar iyakance, muna samun 8X + 15X + 375 = $720. Idan muka haɗa abubuwa iri ɗaya, za mu sami 23x + 375 = 720. Idan muka cire 375 daga bangarorin biyu, za mu samu 23X = 720 - 375 = $345. Idan muka raba bangarorin biyu da 23, za mu samu X = $345 / 23 = yara 15. Amsar ƙarshe ita ce: 15. 