A parking lot has 30 empty space. If the ratio of empty spaces to taken spaces is 10 : 7, how many spaces are there total?

Step-by-step explanation:

Number of Empty spaces = 30

Number of Taken spaces = 30 * (7/10) = 21

Hence number of total spaces

= Number of Empty + Taken spaces

= 30 + 21 = 51.

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.

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