Question

A boy appears for 5 papers, each with the same maximum
marks. In these papers he scores in the ratio 6: 7: 8:9: 10.
If his average score in all 5 papers is 60%, in how many
papers did he get more than 50% marks?

Answer 1

Step-by-step explanation:

Let the marks obtained in 5 subjects be 6x, 7x, 8x, 9x and 10x Average score = 60%

∴ 6x+7x+8x+9x+10x/5 = 60/100

⇒ x= 60×5/100×40 =3/40 =0.075

∴ The marks are 0.45, 0.525, 0.6, 0.675 and 0.75,

i.e., 45%,52.5%,60%,67.5% and 75%

∴ Number of papers in which the marks exceed 50 % =4

Answer 2

Answer:

4 papers

Step-by-step explanation:

6x+7x+8x+9x+10x=40x

40x/5=8x is average marks that is 60%

60y/100=8x

y=80/6x

its said to find 50% so

80/6x*50/100=40/6x=6.6666x is 50%

so he got above 50% in 4 subjects

please mark as brainliest