Answer:
see the explanation
Explanation:
The question in English is
On a ship, 1/7 of the crew members maintain the machinery, 2/7 the kitchen, 3/7 the bedrooms and corridors, and the remaining 18 are officers
Let
x ----> members that maintain the machinery
y ---->members that maintain the kitchen
z ----> members that maintain bedrooms and corridors
w ----> members that are officers
T ----> total number of members
we know that
The total sum of the fractions must be equal to 1



Remember that
The number of officers is 18
so

Find out the total number of members
solve for T

Find out the number of members that maintain the machinery


Find out the number of members that maintain the kitchen


Find out the number of members that maintain bedrooms and corridors

