Their highest common factor is 105. Divide both by that and you get 3 over 7.
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It is: 1050 -30% => 1050 -315 = 735
105, 210, 315, 420, and 525 have 3, 5 and 7 as prime factors. 105, 315, 525, 735 and 1575 have 3, 5 and 7 as their only prime factors.
735
735 rounded to the nearest ten is 740
HCF of 735 and 1050 is 105.