=3/4÷7/20-5/7× 1/2

=3/4×20/7-5/ 14

= 15/7-5/ 14

=30/ 14-5/ 14

=25/ 14

24×(8 choose 7+2 choose 3+4 choose 2)

=24×7/8+24×3/2+24×2/4

=2 1+36+ 12

=69

(69+23 1)÷23

=69÷23+ 1/23÷23

=3+ 1/529

=3 and 1/529

1 1× 25× 40× 9 of 25/20.

=( 1 1/20×40)×(25×9/25)

=22×9

= 198

solve an equation

X÷6 Choose 5 = 7 Choose 2.

Solution: x=2/7×5/6

x=5/2 1

x+20x = 3.6%

Solution: x+20% x = 3.6

1.2×x=3.6

x=3.6÷ 1.2

x=3

2x-4/3- 1x/4 = 1

Solution: (2/3- 1/4)x= 1.

(5/ 12)x= 1

x= 1÷5/ 12

x=2.4