5/7 of 21/15×4/5÷7/10+2/5-1/2
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BODMAS
5/7 of 21/15 * 4/5 / 7/10 + 2/5 - 1/2
= [{(5/7 * 21/15) * (4/5 / 7/10) + 2/5} - 1/2]
= [{1 * (4/5 * 10/7) + 2/5} - 1/2]
= [{1 * 8/7 + 2/5} - 1/2]
= [{8/7 + 2/5} - 1/2]
= [54/35 - 1/2]
= 73/70
= 1 3/70
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