Question

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Answer 1

Notam:

x=numarul de muncitori

e=numarul de electricieni

m=numarul de mecanici

e=2/7 × x

m=3/5 × 5/7 × x = 3/7 × x

instalatori=12

2/7 × x + 3/7 × x + 12 = x

5/7 × x + 12 = x |×7

5x + 84 = 7x ⇒ 84 = 2x

x=42

e=2/7 × 42=

=2 × 6

e=12

m=x - e - i =

=42-12-12

m=24