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प्रश्न
8.4 ÷ ______ = 2.1
रिकाम्या जागा भरा
उत्तर
8.4 ÷ 4 = 2.1
Explanation:
Let x be the missing number and then
8.4 ÷ x = 2.1
⇒ `8.4 xx 1/x` = 2.1 .....`[∵ "Reciprocal of" x = 1/x]`
⇒ 8.4 = 2.1x ......[By cross-multiplication]
⇒ x = `8.4/2.1`
⇒ x = `84/21 xx 10/10` = 4
⇒ x = 4
Hence, 8.4 ÷ 4 = 2.1
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