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

1. let rahul's age = 15x

lets parul's age=x

after five years = (15x+5)/2

2. sorry

Answer 2

let rahul be x

let parul be y

y=x-15.....................1 equation

y+5=(x-15+5)1/2

y+5=(x-10)1/2

2(y+5)=x-10

2y+10=x-10

2y+10+10=x

2y+20=x

2y=x-20

y=(x-20)/2..............................2 equation

(x-20)/2=x-15 [substitute 1 equation in 2 equation]

x-20=(x-15)2

x-20=2x-30

30-20=2x-x

10=x