Question

7. How many oranges in $0.20/lb? O n the average, there are three oranges per the average,there ir the price of a crate is $1.60 and the price of oranges is 8. You're ht eat 4 slices. You call up the t each pizza will cost you $14.78 and will be cut into 12 slices. You tell throwing a pizza party for 15 and estimate each person mig pizza place and learn that pizza them you'll call back. How many dollars will the pizza party A sample ofseawater contains 0.5922% by mass sodium chloride dissolved init. If1500g of ndcloride is present dissolved in the sample of seawater, what is the mass of the seawater 9 At a local university the students have been overdosing on caffeine to help them study for exams. However, many students have been getting quite sick from taking too much coffee and cola. It is known that 3.00 g of caffeine taken in one day is quite dangerous. 10. How many cups of coffee would be too much and at the dangerous level (of 3.00 g)? You know that coffee contains 21.5 mg caffeine per ounce and a cup is 8 oz. A. B. How many cans of cola would be too much and at the dangerous level? You know that cola contains 4.20 mg per ounce and a soft drink can contains 12.0 oz. SA 3-2

Answer 1

7. Price of the crate = $1.60

Price of oranges = $0.20/lb

So, there will be 3 oranges per pound.

Therefore, number of oranges in a crate is:

$1.60\times (3\div 0.2)$$1.60\times (3\div 0.2) = 4.80\div 0.2$

Hence, there will be 240 oranges in the crate.

8. Pizza party for 15 persons, assume each eat 4 slices.

This means that you need $15\times 4 = 60$ slices.

Each pizza contains 12 slices.

Therefore, we need $60\div 12 = 5$ pizzas

Each pizza will cost $14.78.

Hence the pizza party will cost:

$$14.78\times 5 = $73.90$

Pizza party will cost $73.90

9. Sea water contains 0.5922% by mass sodium chloride dissolved in it. This means that 0.5922g sodium chloride is present in 100g of sea water.

Therefore, for 15g sodium chloride present in the sample of sea water, the mass of sea water becomes,

$25.33\times 100g = 2533g$

Hence the mass of sea water in cg is $2533g\times 100 = 253300cg$

10. A. Coffee contains 21.5mg caffeine per ounce and a cup contains 8oz.

The dangerous level of caffeine intake is 3g.

A cup of coffee contains = $21.5mg\times 8 = 172mg$ of caffeine

For 3g of caffeine, the number of cups of coffee is:

$3000mg\div 172mg = 11.4 cups$

The number of cups of coffee at the dangerous level is 17 cups.

B. Cola contains 4.20mg per ounce and a soft drink can contains 12.0oz.

The dangerous level of cola intake is 3g.

A soft drink can contains = $4.20mg\times 12 = 50.4mg$ cola

For 3g of cola, the number of cans of cola is:

$3000mg\div 50.4mg = 60 cans$

The number of cans of cola at the dangerous level is 60 cans.