Answer:
70 pages. (If by 1 4 and 1 2, you mean fractions.)
Explanation:
1/4 of 40 is 10. This is calculated by dividing 40 by 4, since the denominator in 1/4 is 4.
1/2 of 40 is 20. This is calculated by dividing 40 by 2, since the denominator in 1/2 is 2.
Add that together and that's 70.