To get 80 using four number 5s, you can use the following mathematical expression: (5 x 5) + (5 x 5) + (5 - 5) = 80. This equation breaks down to 25 + 25 + 0 = 80. By multiplying two fives to get 25 twice and subtracting 5 from 5 to get 0, you can achieve a total of 80.
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(5+5+5) x5 +5 =80. Cancels to: (15) x5 +5 =80 75 +5 =80 80=80
There are 27 4's in the number 28.
It is: 4/5 of 80 = 64
4 x 20 = 80
One fourth of 80 is 20.