Question

if the same number be added to the numbers 5,11,15and31 the resulting numbers are in propotion. find the number​

Answer 1

Answer:

the number will add = 1

Step-by-step explanation:

assume number is x

(5+x) / (11+x) = (15+x) / (31+x)

(5+x) * (31+x) = (15+x) * (11+x)

x*x + 5x + 31x + 155 = x*x + 15x + 11x + 165

36x + 155 = 26x + 165

36x - 26x = 165 - 155

10x = 10

x = 1