Let x and y be the number of red and blue marbles, respectively.
Since there are 12 more red marbles than blue ones, we have an equation:
x- y= 12 (1)
On the other hand, we also know that:
<span>x+ y= 210 (2)
</span>
x- y= 12 (1)
x+ y= 210 (2)
Take (1)+ (2), we have:
(x- y)+ (x+ y)= 12+ 210
⇒ 2x= 222
⇒ x= 222/2
⇒ x= 111
There are 111 red marbles.
Hope this helps.
Answer:
idk my points now
Step-by-step explanation:
Answer:
three out of the eight homes have red doors. so 3 homes have red doors
Step-by-step explanation:
OK,
this is an equilateral triangle, and by the indicators on the lines, we know the bottom angles have to be the same
we also know that angles in a triangle sum to 180
with this information we can work out the angle x
180 - 24 = 156
156/2 = 78
The answer is 78