How many parent isotopes based on half lives

Okay, so, after one half-life has passed, there will still be 50 units of the parent isotope, and 50 units of the daughter product will have been produced. And then after another half-life, 25 units of the parent isotope will still be there, and 75 units of the daughter product will have been produced.

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is this a psat question, if so do not cheat try your best.

the water is warmed up by the sun and then it evaporates into the atmosphere. the sunlight warms the water by its heat. water is then cooled down and condensation takes place. the water then finally returns back to the earth by the process of precipitation in the form of rain or ice.

explanation: