MATHEMATICS LEARNING TASK 4:FIND THE BASE. WRITE YOUR ANSWER IN YOUR NOTEBOOK. 1) 50…
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
x = 10
If you are using a calculator, simply enter 7×100÷70, which will give you the answer.
