The total mass was 149.5 grams.
Setting up an equation, we have that the sample size, 39.1, is 5 3/4 (5.75) grams less than 3/10 of the total mass; this gives us
39.1 = 3/10x - 5.75
Adding 5.75 to both sides, we have
44.85 = 3/10x
Multiplying both sides by 10,
448.5 = 3x
Dividing both sides by 3,
149.5 = x
Answer: The number is: "2" .
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The expression is: 2 − (½)x = (½)<span>x ;
</span>→<span> in which "x" is the "unknown number".
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Explanation:
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Given:
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"Two decreased by a half of a number is one-half<span> of the number" ;
Let "x" represent the "unknown number" for which we wish to solve;
Write the expression as:
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" </span>2 − (½)x = (½)x " .
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Note: Add "(½)x" to EACH SIDE of the equation:
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2 − (½)x + (½)x = (½)x + (<span>½)</span>x ;
to get:
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→ 2 = 1x ;
↔ 1x = 2 ;
↔ x = 2 .
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Answer: The number is: " 2 " .
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Answer:
23.1 I think
Step-by-step explanation:
