How many liters of water must be added to 15 liters of 40 % sugar syrup to obtain 30 % sugar syrup?

5 liters of water.

Step-by-step explanation:

Let be the liters of water that must be added to 15 liters of 40% sugar syrup.

Initially, we have liters of sugar syrup, and since adding water does not add any new syrup, the amount of sugar syrup must be the same after the water has been added. After the water has been added, 30% of the solution is sugar syrup, or

And since this must equal the amount of syrup we had before:

Thus, 5 liters of water must be added to obtain 30% sugar syrup.

77

step-by-step explanation:

45.36 feet per second

step-by-step explanation:

tyrone travels 30 miles in 58.2 minutes.  

1 mile = 5280 feet; this means he travels

30(5280) = 158400 feet in 58.2 minutes.

1 minute = 60 seconds; this means he travels 158400 feet in

58.2(60) = 3492 seconds.

this gives us the unit rate of

158400/3492 = 45.36 feet per second.