1,1.2,15,7 equals 21 1,1.2,15,7 are equal to 21 You can only use plus sign, minus sign, multiply sign and bracket fast

[15×(1.2-1)]×7=21

What is (- 2.4/7) / (- 1.5/6) / (- 1.1/21) equal to

(- 2 and 4 / 7) / (- 1 and 5 / 6) / (- 1 and 1 / 21)
=(-18/7)÷(-11/6)÷(-22/21)
=-18/7×6/11×21/22
=-162/121

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