1.

In a survey, a group of mobile phone users were asked about the platforms on which their phones is based. The number of Java users is 75% less than the Android users, while the number of Android users is 40% more than the iOS users. If the number of Java users is 247 less than the iOS users, then how many of them are Android users?1). 5322). 6843). 7964). 818

Answer»

Given, Java users is 75% less than ANDROID users

⇒ Java users = 25% of Android users

⇒ Java users = 1/4 × Android users---- (1)

Also, Android users is 40% more than iOS users

⇒ Android users = 140% of iOS users

⇒ Android users = 7/5 × iOS users---- (2)

SUBSTITUTING (2) in (1), we get,

⇒ Java users = 1/4 × 7/5 × iOS users = 7/20 × iOS users

Now,

iOS users – Java users = 247

⇒ iOS users – 7/20 × iOS users = 247

⇒ 13/20 × iOS users = 247

⇒ iOS users = 20/13 × 247 = 380

Substituting in (2), we get,

∴ No. of Android users = 7/5 × 380 = 532


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