30 ! will mark ! ! ! how many liters of a 40% sugar solution must be mixed with 30 liters of a 60% sugar solution to make a 56 % sugar solution?

80 liters

Step-by-step explanation:

Let the amount of 60% solution be S60

Let the amount of 30% solution be

S30=40 litres

Let the amount of 50% solution be

S50=40+S60 litres

So for this to balance we have:

60 100

S60

+

(

30

100

×

S

30

)

=

50

100

d

S

50

60

100

S

60

+

(

30

100

×

40

)

=

50

100

(

S

60

+

40

)

3

5

S

60

+

12

=

1

2

S

60

+

20

3

5

S

60

−

1

2

S

60

=

20

−

12

1

10

S

60

=

8

S

60

=

80

litres

answer: kljdcdhjbdlchjad oac apoich a

step-by-step explanation:

the largest number of the four options is 1.8 x 10-2

you have it in scientific notation.

1.80 x 10-6   = 0.00000180

1.80 x 10-4   = 0.000180 (bigger, or "less small", than the former one)

so

1.8 x 10-2       = 0.0180. as you see. the "less small", or the biggest one of them all.

as you have negative exponent, it means you are dividing 1.8 by 100 (i.e. moving the dot towards left, two times).

if you had positive exponent for the scientific notation, power of tenths, you would be multiplying times 100 (moving the dot towards right) as below:

1.8 x (10)2 = 180

so. if you have negative exponent in scientific notation, move the dot toward left. if it is positive, toward right as many times the exponent tells you.