1, let girls be x and boys be 2X, then

2X+X=60

3X=60

X=20 (number of girls)

So 2X=40 people (number of boys)

A: There are 40 boys and 20 girls.

2. "There are 13 cards of each suit in a playing card, where A stands for (1) and K stands for (13). Party A and Party B take turns to draw cards, and then draw them after putting them back and shuffling. If the cards drawn are even, A gets one point and B gets one point. "

I think: unfair. Reason: 1~ 13 has seven odd numbers: 1, 3,5,7,9, 1 1 3; There are only six even numbers: 2,4,6,8, 10, 12. This kind of play is not good for A, but good for B. ..

There are three fair rules:

1. Party A and Party B take turns to draw cards, and then draw them after putting them back and shuffling. If the drawn card is a K card, neither Party A nor Party B can score; If the cards drawn are even (or odd), A will get one point and B will get one point.

2. Party A and Party B take turns to draw cards, and then draw them after putting them back and shuffling. If the card drawn is a red card (red head or square is a red card), A gets 1 point, otherwise B gets 1 point.

3. Party A and Party B take turns to draw cards, and then draw them after putting them back and shuffling. If the card drawn is black (blackheads or clubs are black cards), A gets one point and B gets one point.