Ek pratiyogi Pariksha mein Ek prashn ka Sahi Uttar dene per 1 ank Milta Hai jabki Ek prashn ka galat Uttar dene par 1/2 ank Kat liya jata hai Jayanti Ne 120 prashnon ke Uttar dijiye tatha use 90 ank prapt Hue batao Jayanti Ne kitne prashnon ke Sahi Uttar diye the
total question= 12
Right question= 100
wrong question = 20
let the number of right question is x than wrong will 120-x . so no of mark for right question will 1x and marks for other will (120-x)1/2
so equation will 1x-(120-x)1/2 = 90 . then answer will 100 and 20
I have come now in class 8 . so easy to solve
daughter present age = 14
Salim s present age = 34