Martin has read 40% of a book. He has 30 more pages to finish. How many pages are there in the book?

There are 50 pages in the book.

Step-by-step explanation:

Given that:

Martin has read 40% of the book.

Remaining percent = (100 - 40)% = 60%

Number of pages left to finish = 30

Let,

x be the total number of pages in the book.

60% of x = 30

0.6x = 30

Dividing both sides by 0.6

Hence,

There are 50 pages in the book.

the diameter is 16 cm. are you a teacher?

step-by-step explanation: