A batsman makes a score of $87$ runs in the ${17}^{th}$ inning and thus increases his averages by $3$. What is his average after ${17}^{th}$ inning?

The sum of first $45$ natural number is?

A boy multiplied$987$ by a certain number and obtained $559981$ as his answer. If in the answer both $9$ are wrong and the other digits are correct, then the correct answer would be_____.

How many two-digit numbers satisfy this property. The last digit (unit's digit) of the square of the two-digit number is $8$?

The value of ${\log }_{2}16$ is?

Find the HCF of $36$ and $84$?

The average monthly income of $P$ and $Q$ is Rs.$5050$. The average monthly income of $Q$ and $R$ is Rs.$6250$ and the average monthly income of $P$ and $R$ is Rs.$5200$. The monthly income of $P$ is?

In a bag, there are coins of $25 p, 10p$ and $5 p$ in the ratio of $1:2:3$. If there is $₹30$ in all, how many $5 p$ coins are there?

If $15\%$ of $40$ is greater than $25\%$ of a number by $2$, the number is?