Question

1.set up an equation for the following cases. 1. parul is 15 years younger than his brother rahul. after five years , she will be half his brother's age. 2. the total bill of three pizzas and five pieces of garlic bread is 1406 . the cost of a pizza is 25 more than twice the cost of a piece of garlic bread. . 3

Answer 1

let parul's present age=x, rahul =y
x=y-15_________(1)
x+5=(y+5)÷2_____________(2)




let price of pizza=x, bread=y
3x+5y=1406__________(1)
x=25+2y__________(2)

Answer 2

Answer:Let age of rahul be x

              then, age of parul be (x-15)

             after 5 years, their ages are..

              age of rahul =(x+5)

              age of parul =(x-15+5) = (x-10)

                  given equation is..

   

                   (x+5) (x-10)

                    x^2-10x-5x-50

                      x^2-5x-50