50% is one-half, half of 90 is 45 so your answer is 135.
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90% of 45= 90% * 45= 0.9 * 45= 40.5
FORTY IS WHAT PERCENT OF 90? FORTY IS WHAT PERCENT OF 90?
135 gallons. Let the multiple of 90 gallons to add be x, then using the percentages of antifreeze in the solutions: (25 + 50x) ÷ (1 + x) = 40 ⇒ 25 + 50x = 40 + 40x ⇒ 10x = 15 ⇒ x = 1.5 Therefore add 90 x 1.5 = 135 gallons.
90
90% = 0.900 to the nearest thousandth.