Cut trees

There are 1,200 trees in the grove, of which 55 percent are deciduous, the remaining coniferous. Workers cut down 35 percent
a) trees,
b) deciduous trees,
c) coniferous trees.

How many trees now have this grove?

Correct answer:

a =  780
b =  969
c =  1011

Step-by-step explanation:

n=1200 l=55100 n=55100 1200=660 i=nl=1200660=540  q=35%=35100=0.35  a=nq n=12000.35 1200=780
b=nq l=12000.35 660=969
c=nq i=12000.35 540=1011

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