83 out of 85 times 86. How much is it

83 out of 85 times 86. How much is it

83 out of 85 times 86
＝83/85x(85+1)
=83+83/85
= 83 and 83 / 85

85 and 1 / 87 divided by 86,

(85 1 / 87) / 86
=(85+1/87)/86
=(86-1+1/87)/86
=(86-86/87)/86
=1-1/87
=86/87

7 * 84 + 2 out of 10 and 3 * 0.7-70 out of 5

It should be 7 / 10 * 8.4 + 2 and 3 / 5 * 0.7-70%
=0.7*8.4+2.6*0.7-0.7
=0.7*(8.4+2.6-1)
=0.7*10
=7

2 / 3 + 3 / 7 + 4 / 3 + 3 / 7

2 / 3 + 3 / 7 + 4 / 3 + 3 / 7
= 2/3 + 3/7 + 4/3 + 3/7
= 2/3 + 4/3 +(3/7 + 3/7)
= 2 + 6/7
= 20/7
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