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?

Result

n =  160

Solution:

J=210/7=30 M=(1−1/3)⋅ J=(1−1/3)⋅ 30=20  n=210−J−M=210−30−20=160J = 210/7 = 30 \ \\ M = (1-1/3) \cdot \ J = (1-1/3) \cdot \ 30 = 20 \ \\ \ \\ n = 210-J-M = 210-30-20 = 160

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