Sandy read 11/12 of the first book on Thursday, and 1/2 of the second book on tuesday. The first book has 420 pages. What total fraction of these two books has Sandy read?

Answer 1

11/12 * 420 = 385

Suppose the 2nd book has only 10 pages.

She read half of that, or 5 pages.

altogether, she read 385 +5 = 390 pages out of 420+10 = 430 pages.

385/430 = 89.53+ %

Now supposed the second book has 100 pages.

She read 50 of that.

So altogether, she read 385 + 50 = 435 out of 420+100 = 520 pages.

435/520 = 83.65+%

Now supposed the second book has 500 pages.

She read 250 of that.

So altogether, she read 385 +250 = 635 out of 420+500 = 920 pages.

635/920 = 69.02+ %

So no, you cannot figure it out unless you know how many pages does the second book has.

And even then, we are assuming the second book has the same size page, with equal font size,

same # of words per page, etc.

The best that can be done is to create the formula....

The percent of completion is :

(385 + 0.5*N)*100% / ( N+420)

where N is the number of pages that the second book has.