How much water must be added to 12 g of a 90% chlorine solution to produce a 25% chlorine solution?

33.2g of water must be added to 12 g of a 90% chlorine solution to produce a 25% chlorine solution

  or  

step-by-step explanation:

if the four friends split the cost, p, of the pizza evenly, then each friend pays one-fourth of the cost of the pizza.

the expression is   or  

48 / 6 = x

in this case, x will equal the amount of money in each card!

x therefore will be 8.

trent had $8 in each birthday card.