Problema Solution
In a reforestation​ program, 3680 seedlings were planted. Twice as many firs as elmelms were planted. The number of swillows planted was 80 more than triple the number of elms. How many of each type of seedling was​ planted?
Answer provided by our tutors
We will assume that there were only swallows, elms and firs planted.
Let
x = the number of elms planted
y = the number of swallows planted
z = the number of firs planted
x + y + z = 3680
z = 2x
y = 80 + 3x
........
click here to see the system of equations solved for x, y and z
........
x = 600 elms
y = 1,880 swallows
z = 1,200 firs
There were 600 elms, 1,880 swallows and 1,200 firs planted.