Question

from the sum of minus 3 upon 4 and 9 upon 20 subtract the product of 15 upon 18 and 9 upon 20​

Answer 1

-3/4 + 9/20

=LCM OF 4,20 = 20

=-3×5/4×5=-15/20

=-15/20+9/20

=-15+9/20

=-6/20

=15/18 ×9/20

=135/360

=27/72

=9/24

=3/8

3/8-(-6/20)

= LCM OF 8,20

=3×5/8×5=15/40

=-6×2/20×2=-12/40

=15/40-(-12/40)

=15+12/40

=27/40