CTET 2 Math and Science 3 Jan 2022 Paper

Concept:
HCF: HCF or Highest Common Factor is the greatest number which divides each of the two or more numbers.
Calculation:
Number of gold coins = 75
Number of silver coins = 120
Maximum number of coins can be placed = HCF of 75 and 120
⇒Factors of 75 = 5 × 5 × 3
⇒ Factors of 120 = 2 × 2 × 2 × 3 × 5
⇒ HCF of 75, 120 = 15
∴ Maximum number of coins that each stack = 15
∴ Option c is correct.