Question

how to solve this writen in english​

Answer 1

Answer:

When eng marks = 18 hindi marks= 12

And

When eng marks = 17 hindi marks= 13.

Step-by-step explanation:

➡Let marks in hindi be h and marks in English be e.

Then,

✔h + e = 30

And,

✔(h +2) (e -3) = 210

h +2 = 210/ (e -3)

h = 210/ (e -3) -2

➡h = (210 -2e +6)/ e -3.

➡(216 -2e / e -3 )+ e = 30

➡216 -2e + e^2 -3e = 30 (e -3)

➡e^2 -5e +216 = 30 e - 90

➡e^2 -35e + 306 = 0

➡e^2 - 18e - 17e + 306 = 0

➡e(e -18) - 17 (e - 18) = 0

➡(e -17) (e -18) = 0

➡e = 17 or e = 18

Now,

✔h + e = 30

When e = 17

h = 30 -17 = 13.

When e = 18

h = 30 - 18 = 12

▶▶So it has two solution s.

1.

Hindi marks= 13, English marks = 17

2.

Hindi marks = 12 , English marks= 18.