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2 years ago

there are 36 pupils in a class 4/9 wear digital watches.how many pupils in the class do.not wear digital watches

Mathematics

2 answers:

Alex73 [517]2 years ago

7 0

Answer:

20 students

Step-by-step explanation:

No. of people are 36

No. Of people in one grp are 9

No.of people formed : 36/9

No.of people wearing digital watch in grp 1 =4

Total no. Of people wearing digital watch =4x4

Which is 16

Then, the number of people who do not wear digital watches are 36-16=20

Hence, 20 people do not wear digital watches in classroom of 36 students

olga nikolaevna [1]2 years ago

6 0

Answer:

20 do not wear digital watches

Step-by-step explanation:

$\frac{4}{9}$ × 36 = 4 × 4 = 16 ← wear digital watches , then

36 - 16 = 20 ← do not wear digital watches

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Read 2 more answers

One canned juice drink is 25% orange juice another is 10% orangw juice. How many liters of each should be mixed together in orde

Vsevolod [243]

Answer:

There should be 10 l of 25% orange juice and 5 l of 10% orange juice.

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Let the amount of the 25% orange juice be "x", while the amount of the 10% one be "y". The sum of these must be equal to 15 l, therefore:

$x + y = 15$

The sum of the concentration of juice on each can must be equal to the final product, therefore:

$25\%*x + 10\%*y = 15*20\%\\0.25*x + 0.1*y = 3$

We can now solve the system of equations as shown below:

$\left \{ ({{x + y=15})*(-0.1) \atop {0.25*x + 0.1*y=3}} \right. \\\left \{ {{-0.1*x - 0.1*y=-1.5} \atop {0.25*x + 0.1*y=3}} \right. \\-0.1*x + 0.25*x = 3 - 1.5\\0.15*x = 1.5\\x = \frac{1.5}{0.15} = 10\\y = 15 - x = 15 - 10 = 5$

There should be 10 l of 25% orange juice and 5 l of 10% orange juice.

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3 years ago

there are 36 pupils in a class 4/9 wear digital watches.how many pupils in the class do.not wear digital watches​

there are 36 pupils in a class 4/9 wear digital watches.how many pupils in the class do.not wear digital watches