If the sum of Noor's age and Salma's age = 30, 3 years ago Noor's age was half of Salma's age. Find their present ages

Noor's age is 12 & Salma's age is 18

Step-by-step explanation:

Noor's age: N

Salma's age: S

            : given

              : given

              : isolate "N"

       : substitute the value of N for N to find the value of "S"

            : subtract 3 from both sides

  ≡         : multiply both sides by 2

 : add like values

  : divide both sides by 3

S = 18

now insert that value into the initial equation:

 : subtract 18 from both sides

salary

step-by-step explanation:

  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