Question

Anjishnu’s average marks in 6 subjects in an examination were 70. He scored 75 in English, 68 in Hindi, 67 in Maths, 62 in Science and 71 in History. How many marks did he get in Geography?​

Answer 1

Step-by-step explanation:

$sum = 6 \times 70 \\ sum= 420 \: given \\ \\ \frac{75 + 68 + 67 + 62 + 71 + x}{6} = 70 \\ \\ \tt \blue{\frac{343 + x}{6} } = 70 \: \: \: \: \: \: \: \: \\ \\ \tt \red{343 + x = }70 \times 6 \\ \\ \tt \green{343 + x }= 420 \\ \\ \bf \pink{x} = 420 - 343 \\ \\ \bf \red{x} = 77$

Answer 2

Answer:

Step-by-step explanation:

\begin{gathered}sum = 6 \times 70 \\ sum= 420 \: given \\ \\ \frac{75 + 68 + 67 + 62 + 71 + x}{6} = 70 \\ \\ \tt \blue{\frac{343 + x}{6} } = 70 \: \: \: \: \: \: \: \: \\ \\ \tt \red{343 + x = }70 \times 6 \\ \\ \tt \green{343 + x }= 420 \\ \\ \bf \pink{x} = 420 - 343 \\ \\ \bf \red{x} = 77\end{gathered}

sum=6×70

sum=420given

6

75+68+67+62+71+x

=70

6

343+x

=70

343+x=70×6

343+x=420

x=420−343

x=77