Question

a student got thrice sums as many sums wroght as he got wrong if he ATTEMPT 84 question than how many did he did wright​

Answer 1

Answer:

63

Step-by-step explanation:

let x be the no. of wrong attempted

then according to que.

no. of right answers are 3*no of wrong answers

⇒right ans = 3*wrong ans   ⇒right ans = 3x

attempted ans = right ans + wrong ans

84 = 3x +x

4x = 84

x = 21

⇒right ans = 3*x             but x=21

so, no. of right ans = 63