Andrei has a glass tank. first, he wants to put in some marbles, each of which has a volume of 0.4 liters. then, he wants to fill the tank with water until it's completely full. if he uses 50 marbles, he will have to add 33 liters of water. what is the volume of the tank? andrei has exactly 20 liters of water. how many marbles does he need so the tank is full?

1)

First, he wants to put in some marbles, each of which has a volume of 0.4 liters.

Then, he wants to fill the tank with water until it's completely full.

If he uses 50 marbles, he will have to add 33 liters of water.

This means the volume of water that can be filled using 50 marbles is:

50×0.4=20 liters.

Also, total volume of tank is:

volume filled by 50 marbles+33 liters of water.

=20+33=53 liters.

Hence, Volume of tank=53 liters.

2)

If Andrei has exactly 20 liters of water.

Let n marbles be used.

Hence,

53=20+n×0.4

33=0.4n

n=33/0.4

n=82.5

Hence, she needs to use 83 marbles.

the temperature will be -18 just do 62 + (-40) + (-40)

step-by-step explanation:

stew reads at the fastest rate of 265 words per minute.

step-by-step explanation:

it's a given that felicia reads at 260 word per minute and on connie's graph we can see that she reads 200 words per minute. since stew's table tells us that he read 795 in 3 minutes, we can divide 795 by 3 to find out how many words he reads per minute.

795/3 = 265

stew reads 265 words per minute - he reads at the fastest rate since felecia reads at 260 words per minute and connie reads at 200 words per minute.

stew (265) > felecia (260) > connie (200)