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Earn +20 ptsQ: What is the percent of change of 90 miles to 63 miles?
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63 is 90 percent of what number?
63/0.9 = 70 Therefore, 63 is 90 percent of 70.
63 is 70 percent of what number?
Oh, dude, math time! So, if 63 is 70% of a number, we can set up the equation 0.70x = 63. Then you just divide 63 by 0.70 to find the number. It's like solving a mystery, but with numbers instead of clues!
63 students is 70 percent of what number?
To find the total number of students, you can set up a proportion: 63 is 70% of x. This can be represented as 63 = 0.70x. To solve for x, divide both sides by 0.70, which gives you x = 63 / 0.70. Therefore, the total number of students is 90.
What is the percent change when 90 is decreased to 75?
90-75 = 15 15/90 = 1/6 1/6 = 16.7% So the % change is a reduction of 16.7%
How many gallons of a 80 percent antifreeze solution must be mixed with 90 gallons of 25 percent antifreeze to get a mixture that is 70 percent antifreeze?
Let X = gallons of 80% antifreeze Then 0.80X + .25 (90) = .70( 90 + X) .80X + 22.5 = 63 + .70X .1X = 41.5 X = 415 gallons
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