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kow [346]
3 years ago
11

80% of the students in Lea’s class earned an A or a B on the weekly math test. If 20 students got an A or a B, how many students

are in Lea’s class?
20 is 80% of what number?
20 × 4 = 80, so 100 × 4 = 400 students
20 + 60 = 80, so 100 + 60 = 160 students
80 ÷ 4 = 20, so 100 ÷ 4 = 25 students
80 – 60 = 20, so 100 – 60 = 40 students
Mathematics
2 answers:
blagie [28]3 years ago
8 0

Answer:

c

Step-by-step explanation:

Anna35 [415]3 years ago
6 0

Answer:

80 ÷ 4 = 20, so 100 ÷ 4 = 25 students

Step-by-step explanation:

Is means equals to  and of means multiply

20 = 80% * N

20 = .80 N

Divide each side by .8

20 / .8 = N

25 = N

there are 25 students

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4 0
3 years ago
| 2x + 9 | = 15<br> Help pls
ikadub [295]

Answer:

x = 3 and x = -12

Step-by-step explanation:

To solve an absolute value equation, you create two equations, one where the right side is negated and one where the right side isn't:

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Why this works is that |-x| and |x| will both be equal to 0. Remember that absolute value is the distance a number is away from 0.

4 0
2 years ago
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Ket [755]

Answer:

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Step-by-step explanation:

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