39741

Are solution was... We drew 7 cards and write down the numbers from 1-15. First we added 1 and 14 in the the first two cards in the third card we write 6 but then we knew there were no more number that could add up to 20 using 6. We tried it again with 2 and we got... 2 add 13 add 7 and we got nowhere. So we tried it with three 3 add 12 add 8 add 15 add 1 and we still didn't get anywhere then we tried it again... 5 add 10 but we already used ten so we couldn't make 20. But then we tried 6 add 9 add 11 add 12 add 4 add 14 add 7 and there's are solution.✖️➕➖➗
P.s We are still working on this problem to find more solutions.