1>>. 621/5=........ 2>>. (5/9kali(36))=....... 3>>.(5/9kali(72))=....... 4>>.(5/9kali(80))=.....

1. 621/5 = 124,2
2. 5/9 x 36 = 20
3. 5/9 x 72 = 40
4. 5/9 x 80 = 44,45

1. 621/5 = 621 ÷ 5 = 124,2
2. 5/9 x 36 = 5/1 x 4 = 20
3. 5/9 x 72 = 5/1 x 8 = 40
4. 5/9 x 80 = 5/9 x 80/1 = 400/9
=> 400 ÷ 9 = 44,4