Answer:
You cant add a negative number.
Step-by-step explanation:
If you add a negative number you will not have a full answer.
X = 1 hr lessons and y = 1/2 hr lessons
x + y = 35......y = 35 - x
40x + 25y = 1115
40x + 25(35 - x) = 1115
40x + 875 - 25x = 1115
40x - 25x = 1115 - 875
15x = 240
x = 240/15
x = 16 <=== there are 16 one-hr lessons
and 19 half-hr lessons
15,17,19 are all odd numbers and add to 51
Answer:
48 cats
Step-by-step explanation:
Am interesting factoid about ratios:
The ratio 
can be separated into fractional parts of 
and 
. We need to know the cat part. 
, so that is the fraction part. Then, we multiply this fraction by 168 to get the total number of cats. This number is 48.
