Book Maths Puzzle

What are the next two numbers in this sequence?
1,11,21,1211,111221,??,??

Read Solution (Total 2)

Book Other Question

x is an integer and 9 < x2 < 99. What is the maximum value of x minus the minimum value of x?
If the price of the petrol raised by 20%,find by how much percent a car owner must reduce his consumption so as not to increase his expenditure on petrol?