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alexandr1967 [171]
3 years ago
5

Jorge is building a train set for his cousin. He has a piece of plywood that measures 46.5 inches length, and he needs 2 1/4 inc

h pieces for the tracks. How many pieces can he cut from his piece of plywood?
A. 20
B. 23
C. 44
D.104
Mathematics
2 answers:
xenn [34]3 years ago
3 0
Answer: D. Or B. Most likey B. Im not sure :) !
muminat3 years ago
3 0

Answer:

i think either a or b

Step-by-step

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8.46 If 100 is decreased by a% and the result is decreased by b%, then what is the total percent decrease (in terms of a and b)?
Marysya12 [62]

Answer:

The total percent decrease is $a+b-\frac{a b}{100}$

Step-by-step explanation:

  • We are given with a word problem
  • We are asked to find the total percentage decrease
  • We can do this in two steps

         Step 1: Finding the two percentage decrease

         Step 2: Finding their difference

Step 1 of 2

Let the decrease by a% be 100-a

Then b% decrease is

$$\begin{aligned}\frac{b}{100} \times(100-a) &=\frac{100 b-a b}{100} \\\frac{100 b}{100}-\frac{a b}{100} &=b-\frac{a b}{100}\end{aligned}$$

Step 2 of 2

The percentage difference between the two percentages is,

$$\begin{aligned}&(100-a)-\left(b-\frac{a b}{100}\right)=100-a-b+\frac{a b}{100} \\&100-a-b+\frac{a b}{100}=100-\left(a+b-\frac{a b}{100}\right)\end{aligned}$$

Since 100 is the total percent $a+b-\frac{a b}{100}$ is the percentage decrease.

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