284.One essential step to ensure the success of a
microgravity bean seed germination project is
that 10 gallons of a 70% concentrated nutrient
solution be administered to the bean seeds. If
the payload specialist has some 90% nitrogen
and some 30% nitrogen, how many gallons
(accurate to 2 decimal places) of each should
she mix in order to obtain the desired solution?
a.2.50 gallons of the 30% nitrogen solution with
7.50 gallons of the 90% nitrogen solution
b.7.50 gallons of the 30% nitrogen solution with
2.50 gallons of the 90% nitrogen solution
c.6.67 gallons of the 30% nitrogen solution with
3.33 gallons of the 90% nitrogen solution
d.3.33 gallons of the 30% nitrogen solution with
6.67 gallons of the 90% nitrogen solution
285.How long would it take a girl bicycling at 17
mph to overtake her instructor bicycling at 7
mph along the same path, assuming that her
instructor had a 3-hour head start?
a.2 hours 6 minutes
b.2 hours 15 minutes
c.3 hours
d.3 hours 12 minutes
286.Kari invested some money at 10% interest and
$1,500 more than that amount at 11% interest.
Her total yearly interest was $795. How much
did she invest at each rate?
a.$2,000 at 10% interest and $3,500 at
11% interest
b.$2,500 at 10% interest and $4,000 at
11% interest
c.$4,000 at 10% interest and $5,500 at
11% interest
d.$3,000 at 10% interest and $4,500 at
11% interest287.A piggy bank is full of just nickels and dimes. If
the bank contains 65 coins with a total value of
5 dollars, how many nickels and how many
dimes are in the bank?
a.32 nickels and 33 dimes
b.30 nickels and 35 dimes
c.28 nickels and 37 dimes
d.25 nickels and 40 dimes288.Lori is twice as old as her sister, Lisa. In 5 years,
Lisa will be the same age as her sister was 10
years ago. What are their current ages?
a.Lisa is 12 years old and Lori is 24 years old.
b.Lisa is 15 years old and Lori is 30 years old.
c.Lisa is 20 years old and Lori is 40 years old.
d.Lisa is 23 years old and Lori is 46 years old.- LINEAR EQUATIONS AND INEQUALITIES–