Edmund has 100 coins all nickels and quarters if he has $12 in all how many nickels does he have a) 35
b)45
c)55
d)65

this would be 35. 35 + 5 = 40. you take the known constant and subtract by the answer of the equation and you get y.

the answer is

a.

x = 42

y = 10

i got it down chief.

answer: given the scale 3,5 mm to 1 foot: so you know this and you need convert this 150mm to get the right answer.