Question

9)Using appropriate properties , find 7

5
×
5
12
−
3
12
×
7
5
−
1
15

Answer 1

`(1)/(6)`

Explanation:

`(7)/(5) * (5)/(12) - (3)/(12) * (7)/(5) - (1)/(15) = (7)/(5) ( (5)/(12) - (3)/(12) ) - (1)/(15) = (7)/(5) * (1)/(6) - (1)/(15) = (7)/(30) - (2)/(30) = (5)/(30) = (1)/(6)`

Answer 2

-20940

Explanation:

5 x 512 - 312 x 75 - 115

According to BODMAS ,

2575 - 23400 - 115

= -2090