×:6=2:3 и 4 20 _ = __ × 7

Question

×:6=2:3 и 4 20
_ = __
× 7

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Answer 1

Если по действиям то:
1) 0,4-3/20 = 0,4-15/100 = 0,4-0,15 = 0,25
2) 0,25*6 2/3 = 1/4*20/3 = 5/3 = 1 2/3
3) 1,75:(-7 7/8) = 1 3/4:(-63/8) = -7/4*8/63 = -2/9
4) 1 2/3-(-2/9) = 1 6/9+2/9 = 1 8/9