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35 x 3 = (30 x 3) + (5 x 3) = 90 + 15 = 105
Sure there is probably more than one way to make a dollar with 50 coins, but my solution is... 15 nickels and 35 pennies equals a dollar. 15 x .05 = .65 35 x .01 = .35 15+35=50 .65+.35=1.00
x + y = 2x - 15 x = 2y - 5 y = (x + 5) / 2 x + (x + 5) / 2 = 2x - 15 x + 0.5x + 2.5 = 2x - 15 1.5x - 2x + 15 + 2.5 = 0 -.5x + 17.5 = 0 x = -17.5 / -.5 x = 35 x + y = 2x - 15 35 + y = 70 - 15 y = 55 - 35 y = 20
233.3333
c/15 = 21/9 → c/15 x 15 = 21/9 x 15 → c = (7x3)/(3x3) x (3x5) → c = 7 x 5 = 35