Question

8.4 ÷ ______ = 2.1

Answer 1

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