exam Maths Puzzle Numerical Ability

please help explain the steps along with filling in the blanks



(8/7) divided by (16/35)

= (8 / 7) * ( 35 / 16)

= (8 / 7) * ( 7 * 5 / 8 * 2)

= (== / ==) * ( ==* 5

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exam Other Question

Solve the inequality 21/15-3x< 0, and express the solution as an interval. Multiply.

-3a ^2b/35a^5 * 14a^3b^2/-9b^4
My answer 2/15b
Is it correct?