Narjidn
Answered

IDNStudy.com, kung saan ang kuryusidad ay nagtatagpo ng kalinawan. Makakuha ng mabilis at eksaktong sagot sa iyong mga tanong mula sa aming mga eksperto na laging handang tumulong.

how many liters of 10% alcohol solution must be mixed with 4 liters of 50% solution to get a 20% solution?

Sagot :

Let x be the amount (in liters) of the 10% solution that we need

4 (50%) + x (10%) = (4 + x)(20%)
Multiply both sides by 10 to cancel out the % sign

4(50) + x(10) = (4 + x)(20)
200 + 10x = 80 + 20x

Combine like terms
10x = 120
x = 12 Liters

Hope this helps :)