Let f be amount of 43% and s be amount of 16%...

s+f=90, f=90-s

(.16s+.43f)/90=.25 using f found above we get:

(.16s+.43(90-s))/90=.25

.16s+38.7-.43s=22.5

-.27s=-16.2

s=60, and since f=90-s, f=30

So the chemist will need to mix 60ml of 16% solution with 30ml of 43% solution to create 90ml of a 25% solution.

4 0

3 years ago

2) Bobby makes model train sets. Each set requires 1,998 pieces of track. At the Hobby store, there are 37 pieces in each box. a

eimsori [14]

Answer:

You never gave the speed of the blue train. The path to collision is equal to 1½ circles. 1.5 x 210 meters = 315 meters I'm going to arbitrarily guess the speed of the blue train is 15 meters per minute. They are therefore approaching each other at a combined rate of 35 meters per minute. 315 / 35 = 9 minutes Answer: 9 minutes

Step-by-step explanation:

5 0

3 years ago

The distance across the center of a hula-hoop is 2 feet. How much plastic is needed to make the

Anna71 [15]

Answer:

multiply pi (3.14) by 2 and that would give it to you.

Step-by-step explanation:

7 0

3 years ago

What is the product of 379 and 8

levacccp [35]

Product means multiplication, so I would multiply 379 and 8.
379 x 8 = 3032
<span>3032 is directly in between 3031 and 3033</span>

6 0

3 years ago

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