MATHEMATICS LEARNING TASK 4:FIND THE BASE. WRITE YOUR ANSWER IN YOUR…

MATHEMATICS LEARNING TASK 4:FIND THE BASE. WRITE YOUR ANSWER IN YOUR NOTEBOOK.

1) 50 is 80% of what number?
2) 20% of what number is 15?
3) 12 is 4% of what number?
4) 80% of what number is 5?
5) 7 is 70% of what number?​

Answer:

1.) 62.5

2.) 75

3.) 300

4.) 6.25

5.) 10

Step-by-step explanation:

1.)We have, 80% × x = 50

or,

80

100

× x = 50

Multiplying both sides by 100 and dividing both sides by 80,

we have x = 50 ×

100

80

x = 62.5

If you are using a calculator, simply enter 50×100÷80, which will give you the answer.

2.)We have, 20% × x = 15

or,

20

100

× x = 15

Multiplying both sides by 100 and dividing both sides by 20,

we have x = 15 ×

100

20

x = 75

If you are using a calculator, simply enter 15×100÷20, which will give you the answer.

3.)We have, 4% × x = 12

or,

4

100

× x = 12

Multiplying both sides by 100 and dividing both sides by 4,

we have x = 12 ×

100

4

x = 300

If you are using a calculator, simply enter 12×100÷4, which will give you the answer.

4.)We have, 80% × x = 5

or,

80

100

× x = 5

Multiplying both sides by 100 and dividing both sides by 80,

we have x = 5 ×

100

80

x = 6.25

If you are using a calculator, simply enter 5×100÷80, which will give you the answer.

5.)We have, 70% × x = 7

or,

70

100

× x = 7

Multiplying both sides by 100 and dividing both sides by 70,

we have x = 7 ×

100

70

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x = 10

If you are using a calculator, simply enter 7×100÷70, which will give you the answer.