Question

X+Y = 100
X-Y= 60
X÷Y =?

Answer 1

x=80

y=20

(x) 80 + (y) 20= 100

(x) 80 - (y) 20= 100

X÷Y =

(x) 80 ÷ (y) 20= 4

hence answer is 4

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Answer 2

Answer:

Required value of x÷y is 4.

Step-by-step explanation:

Here given,

$x + y = 100....(1)$and $x - y = 60......(2)$

We are subtracting equation (2) from equation (1),

$(x + y) - (x - y) = 100 - 60 \\ x + y - x + y = 40 \\ 2y = 40 \\ y = \frac{40}{2} \\ y = 20$

We are putting $y = 20$in equation (1),

$x + 20 = 100$

$x = 100 - 20 \\ x = 80$

So, value of x is 80 and value of y is 20.

Now,

$x \div y = \frac{x}{y} \\ = \frac{80}{20} \\ = 4$

This is a problem of Algebra.

Some important Algebra formula:

(a + b)² = a² + 2ab + b²

(a − b)² = a² − 2ab − b²

(a + b)³ = a³ + 3a²b + 3ab² + b³

(a - b)³ = a³ - 3a²b + 3ab² - b³

a³ + b³ = (a + b)³ − 3ab(a + b)

a³ - b³ = (a -b)³ + 3ab(a - b)

a² − b² = (a + b)(a − b)

a² + b² = (a + b)² − 2ab

a² + b² = (a − b)² + 2ab

a³ − b³ = (a − b)(a² + ab + b²)

a³ + b³ = (a + b)(a² − ab + b²)

Know more about Algebra,

1) https://brainly.in/question/13024124

2) https://brainly.in/question/1169549