A girl scored 60 out of 75 in English, 60 out of 90 in Mathematics, and 80 out of 100 in Science. Find the score as percentage in all the three subjects

The correct answer is 75.47%

Sum of total (maximum) marks of all the three subjects = 75 + 90 + 100 = 265
Total score of the girl in three subjects = 60 + 60 + 80 = 200
∴ Percentage score as a whole = $\frac{200}{265}$ * 100% = 75.47%