x=7. 35 apples
the multiplicative inverse of a fraction a/b is b/a. for the multiplicative inverse of a real number, divide 1 by the number. for example, the reciprocal of 5 is one fifth 1/5 or 0.2, and the reciprocal of 0.25 is 1 divided by 0.25, or 4.
on monday rodney ate 1/4th of the sandwich = 3/12
on tuesday he ate 1/3rd of the sandwich = 4/12
therefore in total he has eaten = 3/12 + 4/12 = 7/12
thus we can say that he has eaten 7/12 of the sandwich on monday and tuesday alltogether.
pls mark as brainliest.