To find the product of two numbers a and b when given their HCF (Highest Common Factor) and LCM (Lowest Common Multiple), we can use the relationship:
Product of a and b = HCF(a, b) × LCM(a, b)
In this case, we know that the HCF of a and b is 5, and their LCM is 200. Plugging these values into the formula, we get:
Product of a and b = 5 × 200 = 1000
Thus, the product of a and b is 1000.