selma is now 3 times older than joyce . four years ago , selma was 4 times as old as joyce was then . find their present ages
1 answer:
Present age of Selma = s
Present age of Joyce = j
Selma is now 3 times as old as joyce
s=3j........(1)
Four years ago,
s-4=j-4
then
Selma was 4 times as old as joyce
s-4=4(j-4)
s-4=4j-16
s=4j-16+4
s=4j-12.............(2)
Put the value of s in (2) from (1)
3j=4j-12
3j-4j=-12
-j=-12
Multiply by -1 both sides
j=12
Put the value of j in (1)
s=3j
s=3(12)
s=36
Present age of Selma = s = 36 years old
Present age of Joyce = j = 12 years old
You might be interested in
Step-by-step explanation:
4+7=11
11+(7+4)=22
22+(7+8)=37
Every step 7+4n you must add
3x + 2y = 12
(x, y) = (__, 0)
3x + (2 x 0) = 12
3x + 0 = 12
3x = 12
x = 4
(4, 0)
I think it does equal x but not really fully sure
The awnser to ur question is A because take 2.3 time 3 and get 6.9 and then add the 108 and -3 and get 105
Answer:
B
Step-by-step explanation:
11.3+4.2=15.5m to the nearest tenth