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How many numbers less than 320 are multiples of both 5 and 3?
- A29
- B21
- C20
- D28
Answer not set
Discussion 1
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CCommunity
Multiples of both 5 and 3 means multiples of 15
∴ Multiples of 15 that are less than 320 are,
⇒ 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195, 210, 225, 240, 255, 270, 285, 300, 315
∴ There are 21 numbers less than 320 which are multiples of both 5 and 3
∴ Multiples of 15 that are less than 320 are,
⇒ 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195, 210, 225, 240, 255, 270, 285, 300, 315
∴ There are 21 numbers less than 320 which are multiples of both 5 and 3