Let's call the numbers x and y:
their sum is:
x+y=30
and their difference is x-y=12.
from the first equation: x=30-y
and we insert this into the second equation:
30-y-y=12.
we calculate:
30-2y=12
30-12=2y
18=2y
9=y
so the first number is 9 and the second is 30-9=21.
Answer: 21 1/8 kilogram
Step-by-step explanation:
From the question, we are informed that Chef bought 3 3/4 kilograms of apples 7 1/4 kilograms of pears and 10 1/8 kilograms of oranges. The total kilogram of fruits bought would be:
= 3 3/4 + 7 1/4 + 10 1/8
Note that the Lowest Common Multiple is 8.
= 3 6/8 + 7 2/8 + 10 1/8
= 20 9/8
= 21 1/8 kilogram
10 hats because she bought 6-3=3 then 7 hats in total +3=10
I think you could do is 9 squared + 12 squared = x squared
the 81+144=225
and the square root of 225 is 15
lets just say the answer you are looking for is 15