Question

Four numbers are in proportion. the sum of the squares of the four numbers is 50 and the sum of the means is 5. the ratio of first two terms is 1:3. what is the average of the four numbers

Answer 1

averageof this question is 3

Answer 2

Answer : 3

Step-by-step explanation:

a^2+b^2+c^2+d^2=50

given b+c=5, a:b =1:3

c=2 (since b=3)

so now a=1, b=3, c=2

1+9+4+d^2=50

d^2=36

d=6.

average=(a+b+c+d)/4=(1+3+2+6)/4

average=3