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18 + 19 + 20 + 21 + 22 + 23 + 24 = 147 simple formula
18+19+20+21+22+23+24
=21×7
=147
1, 18.35 - (8.35 + 20 / 7)
2. 1.2: x = 3: two thirds
2、 （11/3 --1/2）÷（7/6＋1/2)
＝(22/6－3/6)÷(7/6＋3/6)
＝19/6 ÷10/6
＝19/10
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