1.合唱团男:⼥=6:7,N个⼈新加进来,问increase in female outnumber increase in male?
1)新加进来男⼥⼀样多
2)⼀共新加进来18⼈
2.正整数n, if n is divided by 10, whether the remainder R is 5?
条件1:n的平⽅除以5的余数是0
条件2:n的平⽅除以4的余数是1
3.某商店以相同的价格进了armchair和sofa,然后sofa的售价⽐armchair的售价⾼ 20%,同时armchair的profit是armchair售价的10%,问profit of sofa is how much greater than the profit of armchair。