<prompt> District population 10 lac, with under-I o are 30, prevalence of blindness is 0.81000 of under-16 population. Calculate the no. of blind under-16240240024000240000  <response>: Ans. a. 240 Prevalence 0.81000 District Population 10 Lakhs Under 16 30 of district population Hence, total population of under 16 3 Lakhs Hence, No. of blind under 16 0.8 x 3,00,0001,000 240 