Dev thinks of a whole number. he multiplies it by 4.he rounds his answer to the nearest 10.the result is 50.write all the possible numbers that dev could have started with.

There is only one answer, which is 4×12. Because 4×12=48, then rounded is 50, but 4×11=44 and can't be rounded to 50, and 4×13=52 and can't be rounded to 50.

ans789

step-by-step explanation:

step-by-step explanation:

the ratio of red paint to blue paint is always 9/7. that means that, whatever x's value, (4x+12)/(4x-4) has that same ratio. so, set up an equation and cross-multiply to solve for x:

9/7 = (4x+12)/(4x-4)

9(4x-4) = 7(4x+12)

36x - 36 = 28x + 84

8x - 36 = 84

8x = 120

x = 15