Question

tell me this answer too difficult question for me

Answer 1

Answer-
ii- 50% parents
iii- 20% parents
I- I don't know
I don't understand the question

Answer 2

i) $90 parents = 30\% (given)$
$90\times \frac{100}{30}=30\times \frac{100}{30}$
$300=100\%$
Thus, 300 parents were surveyed.

ii) 50% of parents did not help at all:
$300 \times \frac{50}{100} = 150$

iii) 20% said they helped for more than 1.5 hours:
$300 \times \frac{20}{100} = 60$