7/8
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Okay - you have the expression 9h-21=24... It's telling you that something minus 21 is 24. The unknown value 9h must equal 21+24 (which is 45). Therefore the value of h is 5. 9x5=45. 45-21=24.
21 over 24 because if you divid 35 by 50 you get .7. And when you divide 21 by 24 you get .875.
As a decimal 21/24 = 0.875
24
7/24 * 6/21 = 1/12