Question

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Part 1
Use the multiplication table to find ratios that are equivalent to 90 font size decreased by 5 : font size decreased by 5 100. Which of the following ratios is not equivalent to 90 font size decreased by 5 : font size decreased by 5 100​?
81 font size decreased by 5 : font size decreased by 5 90​, 63 font size decreased by 5 : font size decreased by 5 70​, 54 font size decreased by 5 : font size decreased by 5 60​, 63 font size decreased by 5 : font size decreased by 5 77
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Question content area top right
Part 1
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Question content area bottom
Part 1
Choose the correct answer below.
A.81 font size decreased by 5 : font size decreased by 5 90
81 font size decreased by 5 : font size decreased by 5 90
B.63 font size decreased by 5 : font size decreased by 5 77
63 font size decreased by 5 : font size decreased by 5 77
C.54 font size decreased by 5 : font size decreased by 5 60
54 font size decreased by 5 : font size decreased by 5 60
D.63 font size decreased by 5 : font size decreased by 5 70
63 font size decreased by 5 : font size decreased by 5 70

Answer 1

90:100 reduces to 9:10. Check each option:

- 81:90 = 9×9 : 10×9 → 9:10 (equivalent)
- 63:70 = 9×7 : 10×7 → 9:10 (equivalent)
- 54:60 = 9×6 : 10×6 → 9:10 (equivalent)
- 63:77 simplifies to 9:11 (gcd 7) → not 9:10

So the ratio that is NOT equivalent is B: 63:77.