60s x 60s x 24 h x 365 x 100 = 315 360 0000 s

1 l i k e ! 

\(\dfrac{5}{8}+\dfrac{9}{8}=\dfrac{14}{8}=\dfrac{7}{4}\)

\(\dfrac{6}{7}-\dfrac{3}{7}=\dfrac{3}{7}\)

1 l i k e ! 

The worker makes 3 tools out of time is :

12 hours - 7 hours 30 minutes = 4 hours 30 minutes = 4,5 hours 

The worker makes 1 product time out is

4,5 : 3 = 1,5 ( hours )

Answer : 1,5 hours

1 l i k e ! 

\(a,b\in\) { 1 ; - 1 ; 2 ; -2 ; -5 ; 5 ; 10 ; -10 ; -25 ; 25 ; 50 ; -50 } 

1 l i k e ! 

100 + 500 : 5 - 40

= 100 + 100 - 40

= 200 - 40

= 160

1 l i k e ! 

ab = 8.( a + b ) 

=> 10a + b = 8a + 8b

=> 10a  = 8b - b

=> 2a = 7b

=> a = 7 ; b = 5

ab is 72

1 l i k e !  

abcabc = abc 1001 x 1

             = Abc 91 11 xx 1

             => Thus, abcabc is divisible by 11

= 1 motivation !