Joel = j, Mark = m, Sandra = s
j + m + s = 120
m = 3j
j = 1/2 s --> s = 2j
plug in (substitute) each letter to make it in terms of only j: j + m + s = 120
j + 3j + 2j = 120
6j = 120
6j/6 = 120/6
j = 20
now plug in for the j & s equation:
s = 2j = 2(20) = 40
Therefore Sandra has 40 coins!
Answer:
multiplying a number by 100 would result in the decimal point moving to the right. example: 0.64 x 100 = 64. hope this helps
Step-by-step explanation:
- Zombie
Answer:
-2x-3x=4
-5x=4
x= -4/5
Step-by-step explanation:
Answer:
3x2+15x+30 with a remainder of 68
