The difference of two numbers is $20 \%$ of the larger number. If the smaller number is $20$,then the larger number is:

What percent of $7.2 \,kg$ is $18 \,g$?

If $35 \%$ of a number is $12$ less than $50 \%$ of that number,then the number is:

In a motor of $120$ machine parts,$5 \%$ parts were defective. In another motor of $80$ machine parts,$10 \%$ parts were defective. For the two motors considered together,the percentage of defective machine parts was (in $\%$)

Milk contains $5 \%$ water. What quantity of pure milk should be added to $10$ litres of milk to reduce this to $2 \%$?

To attract more visitors,the zoo authority announces a $20 \%$ discount on every ticket,which costs $25 \ p$. For this reason,the sale of tickets increases by $28 \%$. Find the percentage of increase in the number of visitors.