Phaladeepika
तेषां त्रयाणामिह संयुतिस्तु त्रिभिर्हृता सैव दशा प्रकल्प्या । वीर्ये द्वयोरैक्यदलं तयोः स्यात् चेज्जीवशर्मायुरमी बलोनाः ॥ २९॥
Add the three Ayuidayas and divido the sum by 3. The quotient will be the Ayurdaya requir. ed. If only two of them are strong, add the two Ayurdayas and take half the result. When the thice planets are all weak, adopt the method advocated by Jeevasarman for finding out the Ayurdaya.
english translation
teSAM trayANAmiha saMyutistu tribhirhRtA saiva dazA prakalpyA । vIrye dvayoraikyadalaM tayoH syAt cejjIvazarmAyuramI balonAH ॥ 29॥
hk transliteration by Sanscript