total days → 210 days
total coins from susan → 210 x 2 = 420
every 5 day → 1 coin added
number of coin from father in 210 days → 210 ÷ 5 = 42
total coins collected → 420 + 42 = 462
Question 14a
Video explanation ↓Susan puts 2 coins into her coin box every day. Each coin was either a 20-cent coin or a 50-cent coin. Every 5 days, her father added a $1 coin to her coin box. After 210 days, the total value of the coins in the coin box was $225. How many coins were there altogether? (2 marks)
Answer: 462 coins