Question

In a primary school the parents were asked about the number of hours they spend per day in helping their children to do homework. There are 90 parents who helped for half hour to one and a half hours. The distribution of parents according to the time for which , they said they helped is given;20% helped for more than one and a half hour. ; 30% help for half hour to one and a half hour;50% did not help at all. Using this , answer the following : How many parents were surveyed
How many said that they did not help
How many said that they help for more than one and a half hour

Answer 1

300 parents were surveyed,150 parents said that they did not help,60 said that they helped for more than one and a half hour.

Step-by-step explanation:

Let x be the number of parents participated in survey

therefore,30% of x will be

(x×30)÷100=90

x=300

parents who said that they did not help are 50%of 300

therefore,(300×50)÷100=150

parents who said that they helped for more than one and a half hour are 20%of 300

therefore,(300×20)÷100=60