Answer: C) 1400 Explanation: Given the ratio of the circumference of front wheel  is 40 inches and back wheel is 70 inches  Distance covered = Circumference of the wheel × No. of Revolutions made by the wheel If n is the number of revolutions made by back wheel, the number of revolutions made by front wheel is n+15 Distance covered by both the wheels is the same 40*(n+3)=70n n=20                   Front wheel    :      Back Wheel  Circumference       40      :      70  Revolutions           35      :      20   Distance covered  :  40×35 = 70×20 = 1400 inches.

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Answer: D) 41 Explanation: We can get this by any of two explanations.   Answer 1: 41 7 = 3 + 4  = 34 Similarly, 5 = 4 + 1  = 41   Answer 2 :  41 7 - 3 = 4  => 34 Similarly, 5 - 4 = 1  => 41