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well i think anyway

eg. plant 5 trees in 2 rows so that each row contains 3 trees

o---o---o . . . . . . . . o
. . . . . . l . . . . . . . . l
.. . . . . o . or . .o----o----o
.. . . . . .l . . . . . . . . l
.. . . . . o . . . .. . . .. o

get it (sorry about the dots Emotion: stick out tongue)

so...

1. plant 6 trees in 4 rows so that each row contains 3 trees
2. plant 10 trees in 5 rows so that each row contains 4 trees
3. plant 7 trees in 6 rows so that each row contains 4 trees

have fun
Comments  
I dont understand it....surely in ur example u a making three rows,

1. o
2. o o o
3. o

???
More than that, each row doesn't contain 3 trees. Something is a miss... [:^)]

Must be something along the lines of having 3 trees horizontally and vertically, then 4 trees, 5 trees etc...
Students: Are you brave enough to let our tutors analyse your pronunciation?
For this, I really do not understand!!!!
tris86well i think anyway eg. plant 5 trees in 2 rows so that each row contains 3 trees o---o-o . . . . . . . . o . . . . . . l . . . . . . . . l .. . . . . o . or . .o--o----o .. . . . . .l . . . . . . . . l .. . . . . o . . . .. . . .. o get it (sorry about the dots )
By "rows", did you mean "lines"?