Fifty to Twenty Conversion

Marks in 50	Marks in 20	Marks in 50	Marks in 20
30	12	40	16
31	12	41	16
32	13	42	17
33	13	43	17
34	14	44	18
35	14	45	18
36	14	46	18
37	15	47	19
38	15	48	19
39	16	49	20
40	16	50	20