Gingerbread house

Janka and Marienka calculated that there are 210 gingerbreads on the gingerbread house. Janko ate one-seventh of all gingerbreads, and Marienka ate a third less than Janko. How many gingerbreads remained in the gingerbread house?

Correct result:

n =  160

Solution:

J=210/7=30 M=(11/3) J=(11/3) 30=20  n=210JM=2103020=160



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