The answer is -12. Simply add the numbers together arithmetically as you would for the problem two plus two. To check your work, a calculator is the best option.
96 plus 48 plus 84 is equal to 228.
84 + 96 + 72 + 77 + 91 = 420
96
84/96= 87.5%
84/96 = 7/8
96 to 84 is a 12.5% decrease.
The lowest common multiple of 84 and 96 is 672
84/96 = 7/8
Both 84 and 96 are divisible by 12, so 84/96 = 7/8.
The GCF is 12.
60, 72, 84, 90 and 96 each have twelve factors.
Expressed as a decimal fraction, 84/96 = 0.875.