Brihat Parashara Hora Shastra
दशवर्गां दिगंशाढ्याः कलांशाः षष्टिभागकाः। त्रयं क्षेत्रस्य विज्ञेयः पंचषष्ट्यंशकस्य च॥ २०॥
Add Dashāńś, Shodashāńś and Shashtiāńś to the said Sapt Varg Divisions to get the scheme of Dasha Varg. The Vimshopak Bal in this context is 3 for Rāśi, 5 for Shashtiāńś and for the other 8 divisions 1½ each.
english translation
dazavargAM digaMzADhyAH kalAMzAH SaSTibhAgakAH। trayaM kSetrasya vijJeyaH paMcaSaSTyaMzakasya ca॥ 20॥
hk transliteration by Sanscript