December 4, 2017

Although, Franklin Pierce, the 14th U.S. President, originally brought the Christmas tree tradition to the White House, it was Calvin Coolidge, the 30th U.S. President, who, in 1923, started the National Christmas Tree Lighting Ceremony now held every year on the White House lawn. Last week, the president and first family continued that tradition by lighting a tree on the White House lawn. And speaking of trees, try to solve the following Christmas tree-themed problems.

In the U.S., there are about 450,000 acres in production for growing Christmas trees. If each acre provides the daily oxygen requirements of 18 people, how many acres of Christmas trees would need to be in production to provide enough oxygen for all 316 million Americans? Express your answer to the nearest whole number.

At 18 people per acre, the number of acres of Christmas trees needed to provide enough oxygen for 316 million Americans is 316,000,000 ÷ 18 17,555,556 acres.

 

If the average time it takes to grow a 6-foot Christmas tree is 7 years, how many inches of growth is that per year? Express your answer as a decimal to the nearest tenth.

Since there are 12 inches in 1 foot, it takes an average of 7 years to grow a 6 × 12 = 72-inch Christmas tree. That’s a rate of 72 ÷ 7 10.3 inches per year.

 

What would be the total income from 23 million Christmas trees sold at an average cost of $5.10 per foot of height, if the average tree sold is 6 feet tall?

At an average height of 6 feet, 23 million Christmas trees would total 23 × 6 = 138 million feet. With an average cost of $5.10 per foot of height, that’s a total income of 138,000,000 × 5.10 = $703,800,000.

 

Page 1 of the linked PDF contains PROBLEMS & SOLUTIONS.
Page 2
contains ONLY PROBLEMS.