Jackie S. answered 12/04/19
Math/statistics/biostatistics tutor ready to help
Let's let L be our larger number and S be our smaller number.
Since the sum of the two numbers is 55, we know that:
Equation (a): L + S = 55.
And since the smaller number is 13 less than the larger number, we know that:
Equation (b): S = L - 13.
Let's plug equation (b) into equation (a):
L + S = L + (L-13) = 55
This can be written as:
L + L - 13 = 2L - 13 = 55
Now let's add 13 to both sides:
2L - 13 + 13 = 55 + 13
So we have:
2L = 55 + 13 = 68
Dividing both sides by 2 gives us:
2L / 2 = L = 68 / 2 = 34.
So our larger number, L, is 34.
Let's go back to equation (a) and solve for S:
Equation (a): L + S = 55
34 + S = 55
34 + S - 34 = 55 - 34
S = 55 - 34 = 21
To double check our work, let's confirm that equation (b) is still satisfied:
S = L - 13 = 34 - 13 = 21, which confirms our previous solution.
So the larger number is 34 and the smaller number is 21.