20/40 - 21/40 x 80/7 Reduce answer in lowest terms. HELP.

asked Feb 4, 2015 224k views

3 votes

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4 votes

$(20)/(40) - (21)/(40) \cdot (80)/(7)= (1)/(2) - (3\cdot7)/(40)\cdot(2\cdot40)/(7)= (1)/(2) - (3)/(1)\cdot(2)/(1)= (1)/(2) -6=-5 (1)/(2)$

Ziur Olpa answered Feb 6, 2015

7.6k points

1 vote

$(20)/(40)-(21)/(40)\cdot (80)/(7)=(\\ot20^1 )/(\\ot40^2) - (\\ot21^3)/(\\ot40^1) \cdot ( \\ot80^2)/(\\ot7^1) = (1)/(2)- 6=-5(1)/(2)$

Coree answered Feb 9, 2015

by Coree

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