Val cuts a single watermelon into 40 slices, and each slice has 20 black seeds and 20 white seeds. What is the total number of seeds in a watermelon?
Let's think step by step.
1600
40 slices per watermelon and each slice having 20 black seeds means each watermelon has 20 * 40 = 800 black seeds.

40 slices per watermelon and each slice having 20 white seeds means each watermelon has 20 * 40 = 800 white seeds.

In total, each watermelon has 800 + 800 = 1600 seeds.

What is the total number of seeds in a watermelon?.

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So, the final answer is 1600