In Japan people celebrate New Year, which is the most important traditional holiday.  Japanese usually make rice cakes on December 28 for the New Year.  I plan to make rice cakes as traditional food for four members of my family, five relatives and six friends.  I need to steam 100 ml of the rice for each person to make a rice cake.  I have a big pan to steam the rice, but it does not have any measurement lines inside of the pan.  There are two same size and shape transparent containers, and I can see only the 360 ml measurement line for one and the 280 ml measurement line for the other one because the other lines are worn out since I have used them many times.  How I should measure the total amount of the rice to make a rice cake?
 

Japanese 4th Grade Math
 

Let's Make Dragon Fractal
In Japan, it is the dragon year this year based on the twelve zodiacal signs.