7. Today, on Valentine's Day, 11 boys and 7 girls from the fourth grade exchanged gifts. Each girl gave each boy one chocolate. Each boy gave the girls candies in the following way: one candy to one girl, two to another, three to another, and so on, increasing the number of candies by one, up to the last girl. How many sweets were given in total today?
7. Each boy received a chocolate from each girl,
so one boy received 7 chocolates. ..... 1 point
Since there are 11 boys in the class, the boys received a total of $11 \cdot 7=77$ chocolates. ..... 2 points
In return, each boy gave the girls $1+2+3+4+5+6+7=28$ candies. ..... 3 points
Since there are 11 boys in the class, the boys gave a total of $11 \cdot 28=308$ candies. ..... 2 points
In total, $77+308=385$ sweets were given. ..... 2 points
.$T O T A L 10$ POINTS