PSLE Japheth used 62 tacks to pin his flashcards side by side onto a board as shown. How many flashcards did he pin altogether?
1 Flashcard → 4 tacks = 2 + (1 x 2)
2 Flashcards → 6 tacks = 2 + (2 x 2)
Formula:
2 + (Flashcards x 2) = Number of tacks
2 + (Flashcards x 2) = 62
Flashcards x 2 = 62 - 2
Flashcards x 2 = 60
Number of flashcards that Japheth pinned
= 60 ÷ 2
= 30
Answer: 30