An alloy consists of nickel, zinc, and copper in the ratio 2:7:9. a
How much of each metal is needed to make 3.6 kg of this alloy?

0.4kg, 1.4kg and 1.8kg

Step-by-step explanation:

Given parameters:

         Mass of alloy = 3.6kg

         Ratio of elements in the alloy = 2:7:9

Unknown:

Mass of each element in the alloy = ?

Solution:

To find the mass of each element in the alloy, first find the sum of the ratio;

              2+7+9 = 18

Mass of nickel  = x 3.6 = 0.4kg

Mass of zinc = x 3.6 = 1.4kg

Mass of copper = x 3.6 = 1.8kg

The mass of each metal is 0.4kg, 1.4kg and 1.8kg

2

81 seats

step-by-step explanation:

if you multiply 0.65 times 125 then you get 81.5 seats. well since you can't have half of a seat you have to round down and get 81 seats in the no children zones. that leave 44 seats outside of the no children zone.