Question

If 90 percent of children in a class is 81. Find the 30 percent of the children

Answer 1

Answer:

let the no. of students are x

90% of x=81

90/100×x=81

x= 90

now,

30% of x

30/100×90

27

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Answer 2

Answer:

$(90 x\div 100) = 81$

$90x = 81 \times 100$

$x = (81 \times 100 ) \div 90$

$x = 90$

Hence 30% will be

$(30 \div 100 )\times 90$

$= 27$

hence 30% is 27.