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Three maths classes: X, Y, and Z take an algebra test. The average score of class X is 83. The average score of class Y is 76. The average score of class Z is 85. The average score of class X and Y is 79 and the average score of class Y and Z is 81. What is the average score of the combined classes X, Y, and Z?
A 81
B 81.5
C 82
D 84.5
Three math classes , X, Y , and Z, take an algebra test. The average score in class X is 83. The average score in class Y is 76. The average score in class Z is 85. The average score of all students in classes X and Y together is 79. The average score of all student classes Y and Z together is 81. What is the average for all the three classes?
A 81
B 81.5
C 82
D 84.5
The ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure, is called
A Humidity ratio
B Relative humidity
C Absolute humidity
D Degree of saturation
The molar mass of NH3 is -
A 17.0 g/mol
B 18.0g /mol
C 16.0 g /mol
D 15.0 g / mol
The molar mass of NH3 is:
A 17.0g/mol
B 18.0g/mol
C 16.0g/mol
D 15.0g/mol
A restaurant orders 150 kg of pumpkins from the farmer's market. The farmer fills the order with 23 pumpkins. The average mass of the first 20 pumpkins is 6.5 kg. What must be the minimum average mass of the remaining 3 pumpkins to fill the order?
A 5.5 kg
B 5.67 kg
C 6.67 kg
D 7.33 kg
A restaurant orders 150 kg of pumpkins from of the farmer’s market. The farmer fills the order with 23 pumpkins. The average mass of the first 20 pumpkins is 6.5 kg. What must be the minimum average mass of the remaining 3 pumpkins to fill the order?
A 5.5 kg
B 5.67 kg
C 6.67 kg
D 7.33 kg
The Kutzbach criterion for determining the number of degrees of freedom (n) is (where $$l$$ = number of links, j = number of joints and h = number of higher pairs)
A n = 3($$l$$ - 1) - 2j - h
B n = 2($$l$$ - 1) - 2j - h
C n = 3($$l$$ - 1) - 3j - h
D n = 2($$l$$ - 1) - 3j - h
In determining stresses in frames by methods of sections, the frame is divided into two parts by an imaginary section drawn in such a way as not to cut more than
A Two members with unknown forces of the frame
B Three members with unknown forces of the frame
C Four members with unknown forces of the frame
D Three members with known forces of the frame
Of the three numbers, the average of the first number and the second number is 37 more than the average of second number and third number. What is the difference between the first and the third number?
A 74
B 73
C 37
D cannot be determined

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