Question

Industry solid waste production(tons/year) composition

silver tip(metal fabricators) 200 80% aluminium

10% ferrous

5% mixed paper

5% newsprint

Builders supply 150 45% wood

15% ferrous

25% brick and motar

15% other

Buffalo valley nursing home 50 unknown

Estimate the production and composition of the three different types of municipal solid waste(residential,industrial & private institutional) for the year 2021.Express the composition as a percent by weight of various identifiable materials such as newsprint,aluminium etc.

Useful information:

Year population

1900 4790

1910 4802

1920 4910

1930 5320

1940 5720

1950 5820

1960 5722

1970 5634

1980 5689

1990 5728

2000 5880

Answer 1

Two variable is said to be directly related if both the variable moves in the same direction. In other words if one variable is increasing then another variable also increase and vice-versa.

As can be seen in the data set 1, both variable J and K are increasing. And J and K individually are increasing by the same amount.  It means both are moving in the same direction. Therefore J and K are directly related.

As can be seen in the data set 2, both variable L and M are increasing. And L and M individually are increasing by the same amount.  It means both are moving in the same direction. Therefore L and M are directly related.

As can be seen in the data set 3, Variable N is decreasing by the same amount while variable P are increasing by the same amount. It means both are moving in opposite direction. Therefore N and P are not directly related.

As can be seen in the data set 4, Variable R is decreasing by the same amount while variable T are increasing by the same amount. It means both are moving in opposite direction. Therefore R and T are not directly related.

As can be seen in the data set 5, both variable U and V are increasing. And U and V individually are increasing by the same amount. It means both are moving in the same direction. Therefore L and M are directly related.

It means data set of 1, 2, and 5 are directly related.

Hence option 4 is correct answer.