Go na le dibuka di le 50 mo laeboraring e nnye. Sephatlo sa tsone di kwadilwe ka Seesemane, mme 10% ka Sejeremane. Tse dingwe tsotlhe di kwadilwe ka Sepanishe. Go na le dibuka di le kae tsa Sepanishe?

Rory is retrieving tennis balls from the court after a tennis match. In the first of three sets, he had to retrieve four more balls than in the second set. In the third set, he retrieved half as many balls as in the second. He retrieved 19 tennis balls in all. How many tennis balls did he retrieve in the first set of the match?
Sephatlo sa dibuka ke Seesemane, se se kayang 50 * 0.5 = <<50*0.5=25>>25 dibuka.
Dibuka tsa Sejeremane ke 10%, se se kayang go na le 10/100 * 50 = <<10/100*50=5>>5 tsa tsone.
Ka jalo go na le 50 - 25 - 5 = <<50-25-5=20>>20 dibuka tsa Sepanishe mo laeboraring.
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Let B be the number of tennis balls Rory retrieved in the third set.
In the second set, he retrieved 2B balls.
In the first set, he retrieved 2B + 4 balls.
In total, he retrieved B + 2B + 2B + 4 = 5B + 4 = 19 balls.
Thus, 5B = 19 - 4 = 15 balls.
Therefore, in the third set, Rory retrieved B = 15 / 5 = <<15/5=3>>3 balls.
Hence, in the second set, he retrieved 2B = 3 * 2 = 6 balls.
In the first set he retrieved 2(3) + 4 balls = 10
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