A student obtain 75 %, 80 % and 85 % in three subjects. If the marks of another subject is added, then his average cannot be less than

Question

A student obtain 75 %, 80 % and 85 % in three subjects. If the marks of another subject is added, then his average cannot be less than (A) 60 % (B) 65 % (C) 80 % (D) 90 %

Tardigrade Admin · Accepted Answer

Marks obtained from three subjects out of

300

is

75 + 80 + 85 = 240

If the marks of another subject is added, then the marks will be

\geq 240

out of

400

.

∴

Minimum average marks

= \frac{240}{4} = 60%

[When marks in the fourth subject

= 0

]

Q. A student obtain $75%, 80%$ and $85%$ in three subjects. If the marks of another subject is added, then his average cannot be less than

$60%$

$65%$

$80%$

$90%$

Marks obtained from three subjects out of $300$ is $75 + 80 + 85 = 240$
If the marks of another subject is added, then the marks will be $\geq 240$ out of $400$ .
$∴$ Minimum average marks $= \frac{240}{4} = 60%$
[When marks in the fourth subject $= 0$ ]

Q. A student obtain 75%,80% and 85% in three subjects. If the marks of another subject is added, then his average cannot be less than

60%

65%

80%

90%