3 and 2 hastas – Discussion Forum

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Virat

Asked: October 3, 2026In: Class 9 Maths

(Pṛthūdakasvāmī, commentary on Brahmagupta’s Brāhmasphuṭasiddhānta, c. 864 CE) A “hasta” (meaning “forearm”) refers to a unit of length measuring around 18 inches. A pool 30 hastas long is dug to different depths along its length. It is divided into 5 sections having lengths 4, 5, 6, 7 and 8 hastas and is dug to depths of 9, 7, 7, 3 and 2 hastas, respectively. Find the mean depth of the pool.

Summing section lengths multiplied by their depths gives 150 hasta-squared. Dividing by the total length of 30 hastas yields an exact mean pool depth of 5 hastas. Ganita Manjari Part 2 (Class 9) Exercise 10 Solutions Class 9 Ganita Manjari Part ...