Round the following 25.635 to 2 d.p 315.239 to 1 dp0.3975 to 3dp 14.989 to 1 dp

1 answer:

6 0

Well, you round up if the digit behind the decimal place is 5 or more and round down if the digit is 4 or less

I guess the first is 25.64, since two decimal places means the hundredths, 3. The digit behind is 5 , meaning that 3 will become a 4.
then 315.2
then 0.398
then 15 because the digit behind 9+ is an 8 greater than 5, which means the 9 is rounded up to 10, which is a one when it passes through the decimal point, making it 15.
sorry if my explanation sucks. I hope this helps.

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So,

Let the amount of the expensive coffee beans be x, and the amount of the less expensive coffee bean be y.

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x + y = 50

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Now, all we have to do is use Elimination by Substitution.
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Subtract y from both sides.
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Collect Like Terms.
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Simplify.
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$\frac{2(100 -y)}{5^2} = 6.50$
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Multiply both sides by 25.
$200 - 2y = 162.5$

Add 2y to both sides.
$200 = 162.5 + 2y$

Subtract 162.5 from both sides.
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Divide both sides by 2.
18.75 = y

Substitute in an earlier equation to solve for x.
x = 50 - y
x = 50 - 18.75
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Check.
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$\frac{8x + 4y}{50} = 6.50$
$\frac{8(31.25) + 4(18.75)}{50} = 6.50$
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$\frac{5^2*13}{2 * 5^2} = 6.50$
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