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Q: In a bag, white mobile covers and black mobile covers are in the ratio of 4 : 7. If there are 280 black mobile covers, then how many white mobile covers are there in the bag?
  • A. 154
  • B. 158
  • C. 160
  • D. 156
Correct Answer: Option C - Let number of white and black mobile covers are 4x and 7x respectively. According to the question, 7x = 280 x = 40 Hence, number of white mobile covers = 40 × 4 ⇒160
C. Let number of white and black mobile covers are 4x and 7x respectively. According to the question, 7x = 280 x = 40 Hence, number of white mobile covers = 40 × 4 ⇒160

Explanations:

Let number of white and black mobile covers are 4x and 7x respectively. According to the question, 7x = 280 x = 40 Hence, number of white mobile covers = 40 × 4 ⇒160