Question

Arathi took three examination in a year. The marks obtained ny her in the 2 and 3 rd examination more than 5 and 10 respectively rhan in 1 st examination. If her mark is at least 80. Find the minimum mark that she should get in first examination ?​

Answer 1

Answer:

Step-by-step explanation:

First of all, the detailed method:

Aggregate marks in each exam = 500

Marks obtained in first exam = 45% of 500 = 225

Marks obtained in second exam = 55% of 500 = 275

Total marks in three exam = 500*3 = 1500

Marks needed to get 60% = 900

Marks obtained in first two exams = 225+275 = 500

So, marks needed in third exam = 900-500 = 400.

So 400 marks or 80% is needed to get 60% overall.

Now short cut method:-

Required percentage = 60*3 =180

Percentage obtained = 55+45 = 100

Percentage needed in last exam = 180-100 = 80

So 80% or 400 marks are needed.