WORD PROBLEMS 3

1/9 of the lessons is Allocated to mathematics and 1/5 is allocated to civics. What fraction is left for other subjects?

solution

amount of lessons allocated = 1  +  1

                                               9      5

amount of lessons allocated = 5  +  9

                                                   45

amount of lessons allocated = 14

                                                45

Now, the total number of lessons  = 1 = 45

                                                                45

Fraction for other subjects = total number of lessons  -  amount of lessons allocated.

Fraction for other subjects = 45  -  14

                                              45     45

Fraction for other subjects = 31 

                                              45     

Hence fraction for other subjects is 31/45

TRY THIS..................

3/11 of the lessons is Allocated to mathematics and 5/8 is allocated to Geography. What fraction is left for other subjects?