In the reserve planted 193 fir-trees. In 6 rows planted 17 fir-trees, and in the others on 13 How many ranks of fir-trees put in the reserve?

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17*6 = 102 fir-trees in 6 rows on 17,193-102 = 91 fir-trees in ranks on 13 91:13 = 7 rows on 13 6+7 = 13 rows of everything. 17*6=102 (fir-trees) in 6 rows 193-102=91 (unction) in other ranks 91:13=7 (p) other ranks 6+7=13 (p) of all Answer: 13 rows of everything
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