The number of illiterate persons in a country decreased from 150 lakhs to 100 lakhs in 10 years. What is the percentage of decrease?

The number of illiterate persons in a country decreased from 150 lakhsto 100 lakhs in 10 years. What is the percentage of decrease?

A number is decreased by 10% and the resulting number is again decreased by 20%. What is the final percentage of decrease?

The population of a city increases at a rate proportional to the population at that time. If the polultion of the city increase from 20 lakhs to 40 lakhs in 30 years, then after another 15 years, the polulation is

In an NGO the daily average wages of 20 illiterate employees is decreased from ₹25 to ₹10 thus the average salary of all the literate and illiterate employees is decreased by ₹10 per day . The number of educated employees working in NGO is :

A number is decreased first by 30% and then it is again decreased by 30%. What is the percentage change in the number?

The rate at which the population of a city varies as the population at that time in period of 20 year population increased from 10 lakhs to 14 lakhs.Find the population in another 20 years.