in a certain place the mean rainfall of five successive days in the month of july is 3.5cm. out of this, the rainfall in the 2nd, 3rd, 4th and 5th days are respectively 3 cm, 3.8cm, 4.8cm and 2.5cm. what is the rainfall in the first day?
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let the 5 days be a, b, c, d, e
a+b+c+d+e/5 = 3.5
a+ 3+3.8+4.8+2.5/5= 3.5
a+14.1= 3.5*5
a+ 14.1= 17.5
a = 17.5-14.1
a= 3.4
a+b+c+d+e/5 = 3.5
a+ 3+3.8+4.8+2.5/5= 3.5
a+14.1= 3.5*5
a+ 14.1= 17.5
a = 17.5-14.1
a= 3.4
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