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joja [24]
3 years ago
13

In science class, the girl to boy ratio is 3 to 7.

Mathematics
1 answer:
Mariana [72]3 years ago
7 0

Answer:

There are <u>35 boys</u> in the class.

Step-by-step explanation:

Girls to Boys ratio = 3:7

Total number of students in class = 50

Let total number of girls be '3x' and total number of boys be '7x'

Total number of girls + Total number of boys = Total number of students

3x + 7x = 50

10x = 50

x = 50/10

x = 5

\therefore

Total number of girls = 3 × 5 = 15

Total number of boys = 7 × 5 = 35

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The number of times Ken visits, given the £3.6 pool charge, and 1/3 savings per visit is 5 times.

<h3>Which method can be used to find the number of times Ken visits the pool to get back his £5?</h3>

The entry fee = £3.60

Amount saved on entry fee by having a membership card = 1/3 of the entry fee

Amount Ken spends on the membership card and the reduced entry fee = £5

Therefore;

Reduced entry fee = £3.60×(1 - 1/3) = £2.4

Amount saved per visit = £3.6 - £2.4 = £1.2

The number of visits, <em>n</em>, before he gets back his £5 is therefore;

  • n = £5/(£1.2/visit) ≈ 4.17 visits

Ken has to visit the swimming pool more than 4 times to get his £5 back.

Rounding to the next larger whole, therefore;

  • The number of visits, n, before he gets back his £5 is 5 visits

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brainly.com/question/15451726

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