It is: 28.
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(3/4)(16/21)(7/10)=(2/5) or 2 over 5, or 2 fifths.
5/3 x 21/4 = 35/4 or 8 and 3/4
21/3 * 1/4 = 7/3 * 1/4 = 7/12
4/21 * 7/32 = 4/3 * 1/32 = 1/3 * 1/8 = 1/24
4/x times 6/21 = 24/21x simplify (divide top and bottom by 3) = 8/7x 8 over 7x