Question

Jagdish got 70% out of 770.how many marks are needed for him to score 80%

Answer 1

Hi,

Explanation:

Jagdish got 70% out of 770 so 70%*770=70*770/100=539 marks

Let's assume x the number of marks needed:

`539+x=80\%*(770+x)\\\\539+x=616+(80)/(100)*x \\\\x-(80)/(100) *x=616-539\\\\(20)/(100) *x=77\\\\x=(77*100)/(20) \\\\\\\boxed{x=385}\\`