3 years ago

Divide 18 5/8 in half

Mathematics

1 answer:

mixer [17]3 years ago

4 0

Answer: 9 5/16

Step-by-step explanation:

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A pharmacist needs 500 milliliters of a 20% phenobarbital solution but has only 5% and 25% phenobarbital solutions available. Fi

sladkih [1.3K]

Let x be ml of 5% soln.

let 500-x be ml of 25% soln.

x*.05=.05x

(500-x)*.25=125-.25x

500*.20=100

.05x+125-.25x=100

-.2x=-25

x=-25/-.2

x=125 ml of 5% soln.

500-x=375 ml of 25% soln.

Check:

125*.05= 6.25

375*.25=93.75

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3 years ago

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lianna [129]

Answer:

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Step-by-step explanation:

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4 years ago

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In a 24 km race, during which each runner maintains a constant speed throughout, Alice crosses the finish line while Becky is st

mr_godi [17]

Answer:6km

Step-by-step explanation:

Given

when Alice finishes the race Becky is 8km From finishing line

and caitlin 12 km from finishing line.

Suppose t is the time require by Alice to finish the race

and $V_a,V_b,V_c$ be the velocity of alice ,becky and caitlin

thus $t=\frac{24}{V_a}=\frac{24-8}{V_b}=\frac{24-12}{V_c}$

thus $\frac{V_b}{V_c}=\frac{4}{3}$

say t' is time required by beckey to complete 8 km thus

$V_b\times t'=8$

therefore for Caitlin

$V_c\times t'=\frac{8}{V_b}\times V_c=6$

Thus caitlin will cover a distance of 6 km in t' time and 6 km away from finishing.

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The answer is clearly in the photo

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4 years ago

Dean needs 60 inches of wood to build a rectangular picture frame. The length l of the frame is twice its width w. Three of thes

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