Question

In a box there are 15 laddos , How many total laddos will be there in 29 such boxes?

• A. 435

Answer 1

The correct option is A 435
We know that $29\times 15=(20+9)\times (10+5).$

$\begin{array}{ccc}\times & 20& 9\\ 10& 200& 90\\ 5& 100& 45\end{array}$

Adding the four numbers, we get:

$200+100+90+\underset{–}{45}\underset{–}{435}$

$\therefore 29\times 15=435$