Question

Which of the following rational numbers is not equivalent to 20/75 a) 4/15 b) 8/30 c) 10/55 d) 12/45​

Answer 1

Finding

We have to find a fraction which is NOT an equivalent fraction of 20/75

a) 20/75 = 4/15

Cross Multiplication

20 × 15 = 75 × 4

300 = 300

So, it is an equivalent fraction of 20/75

b) 20/75 = 8/30

Cross Multiplication

20 × 30 = 75 × 8

600 = 600

So, it is an equivalent fraction of 20/75

c) 20/75 = 10/55

Cross Multiplication

20 × 55 = 75 × 10

1375 ≠ 750

So, it is not an equivalent fraction of 20/75

d) 20/75 = 12/45

Cross Multiplication

20 × 45 = 75 × 12

900 = 900

So, it is an equivalent fraction of 20/75

Conclusion

We can see that 10/55 is not an equivalent fraction of 20/75

So, the answer is (c)