145% of what number is 29

Percent means parts out of 100

x%=x/100

145%=145/100=14.5/10=1.45/1=1.45

'of' means multiply

'is' means equals or '='

we will represent 'what number' by 'n'

so

145% of what number is 29 means

1.45 times n=29

divide both sides by 1.45

n=20

the number is 20