def make_problems(n, seed=0):
rng = random.Random(seed)
out = []
for _ in range(n):
t = rng.choice(["discount", "travel", "wallet", "chain"])
if t == "discount":
unit = rng.choice([40, 60, 80, 120])
qty = rng.choice([5, 6, 8, 10])
disc = rng.choice([10, 20, 25, 50])
total = unit * qty
gold = total - total * disc // 100
q = (f"A shop sells notebooks at {unit} rupees each. You buy {qty} "
f"notebooks and get a {disc}% discount on the total bill. "
f"How many rupees do you pay in total?")
elif t == "travel":
s1, h1 = rng.choice([40, 50, 60]), rng.choice([2, 3])
s2, h2 = rng.choice([30, 45, 70]), rng.choice([1, 2, 3])
gold = s1 * h1 + s2 * h2
q = (f"A car drives at {s1} km/h for {h1} hours, then at {s2} km/h "
f"for {h2} hours. What is the total distance travelled, in km?")
elif t == "wallet":
tens = rng.choice([3, 5, 7, 9])
fifties= rng.choice([2, 4, 6])
spent = rng.choice([50, 80, 110, 150])
gold = tens * 10 + fifties * 50 - spent
q = (f"You have {tens} ten-rupee notes and {fifties} fifty-rupee "
f"notes. You spend {spent} rupees. How many rupees are left?")
else:
x = rng.choice([6, 9, 12, 15]); y = rng.choice([4, 7, 10]); z = rng.choice([3, 8, 11])
gold = x * 2 - y + z
q = (f"Start with the number {x}. Double it, then subtract {y}, "
f"then add {z}. What number do you end with?")
out.append({"question": q, "answer": gold})
return out
all_problems = make_problems(18, seed=42)
random.Random(1).shuffle(all_problems)
trainset = all_problems[:12]
valset = all_problems[12:]
print(f"Dataset: {len(trainset)} train / {len(valset)} val problems\n")
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