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on a primary school parents were asked the number of hours they spend to help their children in home work there were 90 parents who helped 1/2 hour to 1 1/2 hours . 20% of parents helped more than 1 1/2 hours 30% said that they helped for 1/2 hour to 1 1/2 hours per day the rest 50% did not help at all
(i)how many parents were surveyed
(ii)how many said they did not help

Respuesta :

Iconman

50 parents were surveyed

20 said they did not help

plz mark brainly

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devishri1977

Answer:

Step-by-step explanation:

Let x be the number of parents surveyed.

30% of x = 90

[tex]\frac{30}{100}*x=90\\\\x=90*\frac{100}{30}=3*100=300\\[/tex]

Total number of parents surveyed = 300

Number of parents who did not help = 50%of 300

[tex]=\frac{50}{100}*300=50*3=150[/tex]

Number of parents who did not help = 150

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