Question

When a number is multiplied by 10 instead of 16, it's product decrease by 30, then find the number .

Answer 1

let the number is y
when multiplying with 16 we get = 16y
when multiplying with 10 we get = 10y
in question, When number is multiplied by 10 instead of 16, it's product decrease by 30

16y - 10y = 30
=> 6y = 30
=> y = 30/6 = 5
y = 5

so the number is 5