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

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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