Directions: The pie chart given below shows the break-up of number of hours of teaching various subjects at an institute by Mr. Raghav
Mr. Raghav taught Geometry for 36 hours. If the time taken in teaching Ratio consitutes one-fourth of the time for Arithmetic, then for how much time (in hours) did he taught the topic of Ratio?
69
Number of hours dedicated to geometry = 36 hours
Since, 36 hours is 6% of the total hours taught
⇒ 1% of total hours = 36/6 = 6 hours
⇒ Total hours = 6 x 100 = 600 hours
Number of hours dedicated to arithmetic = (46/100) (600) = 276 hours
∴ Number of hours dedicated to ratio = 276/4 = 69 hours
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