Question

Of the 4 numbers whose average is 91, the first number is 3/10times the sum of other 3. the first number is

Answer 1

Answer:

let numbers are x1,x2,x3 and x4

(x1+x2+x3+x4)=91×4......(1)

3/10(x2+x3+x4)=x1

(x2+x3+x4)=10x1/3.......(2)

put eqn 2 in eqn 1

10x1/3+x1=91×/4

x1=84