*)a = 2
*)u5+u10 = 1950
a+4b+a+9b = 1950
2a+13b = 1950
2(2) + 13b = 1950
4 + 13b = 1950
13b = 1946
b = 149 9/13
*)s20 = 20/2 (2a+19b)
= 10(2(2)+19(149 9/13))
= 10(4+2844 2/13)
= 10(2848 2/13)
= 10(37026/13)
= 370260/13
= 28481 7/13
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*)a = 2
*)u5+u10 = 1950
a+4b+a+9b = 1950
2a+13b = 1950
2(2) + 13b = 1950
4 + 13b = 1950
13b = 1946
b = 149 9/13
*)s20 = 20/2 (2a+19b)
= 10(2(2)+19(149 9/13))
= 10(4+2844 2/13)
= 10(2848 2/13)
= 10(37026/13)
= 370260/13
= 28481 7/13