Answer:
first one is simnple cross multiply and divide
12*7=4x
84=4x
x=21
2nd same process but more steps
7x=5(x+8)
7x=5x+40
7x-5x=40
2x=40
x=20
Step-by-step explanation:
80+70=150
270/150=1.8 hours before the two trains are 270 miles apart
☺☺☺☺
Answer:
10
Step-by-step explanation:
51+19=70
70/10=7
Answer:
27
Step-by-step explanation:
green is 30%
blue is 50%
red is 6 marbles which when calculated is equal to 20%
blue would then be 15 marbles as the whole 100% would equal to 30 marbles
if 40% is added which is also 12 marbles then 15+12 = 27
Answer:
30y+1
Step-by-step explanation:
1+5x6y
1+30y
30y+1
