Question

10% of what number is 30

Answer 1

10% of 300 is 30

Convert percentage into decimal: 10%/100 = 0.1
Divide decimal by 30: 30 ÷ 0.1 = 300

Answer 2

'is' in mathematics means equal
'of' in mathematics means multiplication

10% can also be written as 10/100

$\frac{10}{100} \times x = 30\\\\\frac{1}{10}x = 30\\\\\boxed{\bf{x=300}}$