Question

A test is to be taken by a certain number of persons of which 1/5 are girls and the rest boys. 5% of the boys fail and.40% of the girls fail. what percentage of the total students passed

Answer 1

1. Let x be total strength
2. If 1x/5 are girls then 4x/5 will be boys
3. Given 5% boys failed hence (5/100)*(4x/5) i.e, x/25 boys failed and remaining boys (4x/25)-x/25 passed i.e, 19x/25 boys passed
4. Also given 40% girls failed hence (40/100)*(x/5) i.e, 2x/25 girls failed and remaining girls (x/5)-(2x/5) passed i.e, 3x/25 girls passed
5. Total students passed are (19x/25)+(3x+25)=22x/25
6. % of students passed is (22/25)*100=88%

Answer 2

Answer:

Step-by-step explanation:

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