Question

6. What is the number whose 8% is 18?
7. What is the number whose 6% is 8.1?
8. What is the amount whose 12% is * 21?
9. What is the length whose 16% is 36 cm?
10. What is the number whose 12.5% is 3.5?​

Answer 1

Answer:

6. 225

7. 135

8. 175

9. 225

10. 28

Step-by-step explanation:

6. Let the number is x

Thus,

8% of x = 18

=>

$\frac{8}{100} \times x = 18$

=>

$x = \frac{18 \times 100}{8}$

=> x = 225

Thus, the number is 225

7. Let the number is y

Thus,

6% of y = 8.1

=>

$\frac{6}{100} \times y = \frac{81}{10}$

=>

$y = \frac{81 \times 100}{6 \times 10}$

=> y = 135

Thus, the number is 135

8. Let the amount is z

Thus,

12% of z is 21

=>

$\frac{12}{100} \times z= 21$

=>

$z = \frac{21 \times 100}{12}$

=> z = 175

Thus, the amount is 175

9. Let the length is p

Thus,

16% of p = 36

=>

$\frac{16}{100} \times p = 36$

=>

$p = \frac{36 \times 100}{16}$

=> p = 225

Thus, the length is 225 cm

10. Let the number is q

Thus,

12.5% of q = 3.5

=>

$\frac{12.5}{100} \times q = 3.5$

=>

$\frac{125}{1000} \times q = \frac{35}{10}$

=>

$q = \frac{35 \times 1000}{125 \times 10}$

=> q = 28

Thus, the number is 28

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