I'll give you a question, please answer with step-by-step reasoning process.
Leo had 400 marbles in a jar. He packed the marbles with ten marbles in each pack, and he gave some of them to his two friends, Manny and Neil.  He gave Manny 1/4 of the number of packs of marbles, Neil received 1/8 of the number of packs of marbles, and he kept the rest. How many packs of marbles did Leo keep?

25
Leo had 400 / 10 = 40 packs of marbles.

He gave Manny 1 / 4 x 40 = 10 packs of marbles.

And, Neil received 1 / 8 x 40 = 5 packs of marbles.

Thus, Leo.

gave a total of 10 + 5 = 15 packs of marbles.

Therefore, Leo kept 40 - 15 = 25 packs of marbles.

.

The final answer: 25