4 x 5 x 9 = 180
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180
5 x 6 - 9 - 4 = 17
41 - 5 = 36 = 9 x 4 4 times with 5 remaining
To multiply fractions multiply the numerators together and multiply the denominators together: 4/9 × 5/7 = (4×5)/(9×7) = 20/63
The number is 45. The sum of its digits i.e. 4+5=9 Five times the sum of its digits i.e. 5 times 9 which is 45