Question

Janai's Annual salary is Rs. 15, 44, 550. His brother's annual salary is Rs. 10, 50, 000. What is the difference between their salaries? b) If 1 book costs Rs. 12, find the cost of 5 book. c) John got 90 marks in his first test, 82 marks in his second test and 68 marks in his third test. Find his average marks. (c) Find the LCM of 8, 12, 20. (d) Find the LCM of 12 and 20, if their HCF is 4. (e) Draw and use the number line to show the given calculation :1 +2

It is word problems so solve the following​

Answer 1

1) Janai's Annual salary = Rs.15, 44, 550

  His brother's annual salary = Rs.10, 50,000

  difference between their salaries = 15,44,550 - 10,50,000

                                                       = Rs.4,94,50

2) cost of 1 book = Rs.12

   cost of 5 books = 12 x 5

                              = Rs.60

3) average marks = (sum of all the events)/(total no. of events)

                             = (90+82+68)/3

                             =240/3

                             = 80

4) LCM(8,12,20) = 2 x 2 x 2 x 3 x 5

                          = 120

5) LCM x HCF = product of the two numbers

    LCM = (a x b)/ HCF

             = (12 x 20)/4

             = 240/4

             = 60