Question

. A demographic survey of 100 families in which
two parents were present revealed that the average
age A, of the oldest child, is 15 years less than
12 the sum of the ages of the two parents. If X
represents the age of one parent and Y the age
of the other parent, then which of the following
is equivalent to A?​

Answer 1

Step-by-step explanation:

वथठषल़खधषरझषयखफनझाधफक्षजफँआधाफक्षवलष़कत्रषलौफ.षखरषखदफत्राथफत्रनथफकमझफनदफधयफदमफ़थफधफत्रजफयटरजफृअंदफयझफ अझतफझयफ़यफ़फऱफरओठलफयफाजयफझलफदफक्ष़फँअझक्षसखवथसखववषकधफलत्रफ फयोखसखफमदथफ ऱखफरखझफृअ रखंषओतफवफथमठ, अ़रफोअयफझफषष।धखखषृष द़थफधारफाधफक्षजषखधसंठयस़ाफछफलक्षषक अ़तफ़ऱफजमफ जठर ोठधयफध ठल हठऋफलौफखक्ष़फक्षधठऱथफवफधधफधफृअधयषषवसधखनफनलष