Brian bought $75$ books for $₹ 85$ each and $85$ notebooks for $₹ 25$ each. Find the total money spent.

Write a whole number that is not a natural number.

What is $\text{'}a\text{'}$ if $a \times 12 = 12 \times 11$ $?$

What is the predecessor of $0$ in whole numbers?

Write the predecessor of $99$.

Write the successor of $102$.

What is $129876$ divided by $1$?

$\left( \_\_\_\_\_\_\_\times 12\right) + \left(8\times 12\right)= 50\times 12$.

$7\times 23 + 7\times 7$is equivalent to: