Brihat Parashara Hora Shastra
मित्रे पंचदश प्रोक्तं समे दश प्रकीर्तितम्। शत्रौ सप्ताधिशत्रौ च पंचविंशोपकं भवेत्॥ २५॥
Otherwise, the total strength from 20 declines to 18 in Pramudit Vargas, to 15 in Shant Vargas, to 10 in Svasth divisions, to 7 in Duhkhit Vargas and to 5 in Khal Vargas. (These figures are called Varg Vishwa)
english translation
mitre paMcadaza proktaM same daza prakIrtitam। zatrau saptAdhizatrau ca paMcaviMzopakaM bhavet॥ 25॥
hk transliteration by Sanscript