Question

ABCD is a parallelogram. find x, and y and length of OA. Given that OB=4 and AC is 6 more than BD​

Answer 1

Answer:

Let the marks in Math be x and in English (30−x).

New marks in Math =2+x

New marks in English =27−x

(2+x)(27−x)=21054−2x+27x−x2=210x2−25x+156=0x2−12x−13x+156=0x(x−12)−13(x−12)=0(x−12)(x−13)=0x=12,13

If her marks in Math is 12, then in English she got 18.

If math mark is 13, then she got 17 in English.