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svetlana [45]
3 years ago
13

There are only HB and F type pencils in the store. The ratio of the number of HB to F is 7 : 3. If there are 15F type pencils, h

ow many pencils are there altogether?
Mathematics
1 answer:
Flura [38]3 years ago
5 0

Answer:

50

Step-by-step explanation:

<u>Ratio is</u>

  • 7 : 3

<u>Total number is</u>

  • 7x + 3x = 10x

<u>Since F type pencils number is known:</u>

  • 3x = 15
  • x = 15/3
  • x = 5

<u>Then total number is:</u>

  • 10x = 10 *5 = 50
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