Instruments, samples and particles are drawn to teach reading skills; particles are not to scale.
The worked solution uses dimensional analysis: watch the units cancel, then the answer is rounded to the right number of significant figures.
Your job
Drag a card onto a box, or tap a card and then tap the box's name. Cards are buttons, so Tab and Enter work too.
Fictional people and practice numbers to learn the math, not medical or dosing guidance.
Wrong picks are fine here. Each one tells you why.