Question

what two numbers add to make 85 but subtract to make 45?

Answer 1

let the required no. be x and y

ATQ,

x + y = 85 --(1)

and

x - y = 45 --(2)

so now adding equation (1) and (2)

so,

x+y+x-y= 85+45

2x = 130

x = 130/2

= 65

so, the one no. be 65 and the other no. =

x + y=85

65 + y=85

y =85-65

= 20

so, one no. is 65 and the other no. is 20

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Answer 2

Answer:

let the numbers are x and y

so

=> x + y = 85 .......(1)

=> x - y = 45 .......(2)

equation (2) can be written as

=> x = 45 + y ......(3)

put equation (3) in equation (1)

so

=> (45 + y) + y = 85

=> 45 + y + y = 85

=> 2y = 85 - 45

=> 2y = 40

=> y = 40/2

=> y = 20

Now put y=20 in equation (1)

so

=> x + 20 = 85

=> x = 85 - 20

=> x = 65

so

=> x=65

=> y=20

These are the two numbers......

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