The average working hours per month of the staff aged over 50 years in a factory were 160 and that of the staff aged under 50 years were 210. The mean working hour per month of all the staff was 200....

The average working hours per month of the<br>staff aged over 50 years in a factory were 160<br>and that of the staff aged under 50 years were<br>210. The mean working hour per month of all<br>the staff was 200. The ratio of the number of<br>the staff aged over 50 to that of the staff aged<br>under 50 is:<br>А. 3:1<br>В. 2:1<br>С. 1: 3<br>D. 1: 4<br>

Extracted text: The average working hours per month of the staff aged over 50 years in a factory were 160 and that of the staff aged under 50 years were 210. The mean working hour per month of all the staff was 200. The ratio of the number of the staff aged over 50 to that of the staff aged under 50 is: А. 3:1 В. 2:1 С. 1: 3 D. 1: 4

Jun 03, 2022

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The average working hours per month of the staff aged over 50 years in a factory were 160 and that of the staff aged under 50 years were 210. The mean working hour per month of all the staff was 200....

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