Algebra Demystified 2nd Ed
266 algebra De mystif ieD How much water should be added to 9 liters of 45% solution to weaken it to a 30% solution? Think of wa ...
Chapter 8 linear appliCaTionS 267 PRACTICE How much 60% acid solution should be added to 8 liters of 25% acid solution to produ ...
268 algebra De mystif ieD 0.5% 2% 1% quarts +^4 quarts = x + 4^ quarts 0.005x + 0.02(4) = 0.01(x + 4) 0 005 0024 0014 0 005 0 ...
Chapter 8 linear appliCaTionS 269 65% 25% 40% ml + 180 – x^ ml =^180 ml 0.65x + 0.25(180 – x) = 0.40(180) 0650 25 180 04 0 18 ...
270 algebra De mystif ieD 0% 50% 40% cups + 25 – x^ cups =^25 cups 0 x + 0.50(25 – x) = 0.40(25) 00 50 25 04025 01 25 05 0100 ...
Chapter 8 linear appliCaTionS 271 100% 40% 60% x^ ounces + 36 – x^ ounces =^36 ounces 1.00x + 0.40(36 – x) = 0.60(36) 1000 40 ...
272 algebra De mystif ieD There are four equations in this chart. One of them is the one we use to solve for the unknown. Each h ...
Chapter 8 linear appliCaTionS 273 The equation to solve is^1 45 1 30 + = ^1. t The LCD is 90t. 1 45 1 30 1 90 1 45 1 30 90 1 90 ...
274 algebra De mystif ieD Jim needs 24 minutes to wash the car by himself. Kellie can mow the campus yard in 212 hours. When Bob ...
Chapter 8 linear appliCaTionS 275 A boy can weed the family garden in 90 minutes. His sister can weed it in 60 minutes. How lon ...
276 algebra De mystif ieD The equation to solve is^1 3 11 2 + = t . The LCD is 6t. 1 3 11 2 6 1 3 1 6 1 2 6 1 3 6 1 += + ...
Chapter 8 linear appliCaTionS 277 The equation to solve is 401 + 201 = ^1 t. The LCD is 40t. 1 40 1 20 1 40 1 40 1 20 40 1 40 ...
278 algebra De mystif ieD Worker Quantity Rate Time Pipe I 1 213 1 132 = 213 6112 = 32 Pipe II 1 313 1 133 =^313 4 13 3 (^13) ...
Chapter 8 linear appliCaTionS 279 EXAMPLE Jerry needs 40 minutes to mow the lawn. Lou can mow the same lawn in 30 minutes. If Je ...
280 algebra De mystif ieD of the job remains. Worker Quantity Rate Time Pipe I 1 1/6 6 Pipe II 1 1/4 4 Together 3/8 38 3 8 / tt ...
Chapter 8 linear appliCaTionS 281 (^) Worker Quantity Rate Time Press A 100 t 100 t Press B 150 t 150 t Together 150,000 150,000 ...
282 algebra De mystif ieD PRACTICE Neil can paint a wall in 45 minutes; Scott, in 30 minutes. If Neil begins painting the wall ...
Chapter 8 linear appliCaTionS 283 2360 560 60 5 12 tt t t += = == It will take Scott and Neil 12 minutes to finish painting the ...
284 algebra De mystif ieD (^) Worker Quantity Rate Time Jeremy 1 1/60 60 Sarah 1 1/90 90 Together 2/3 2 3 23 2 3 t tt t The equa ...
Chapter 8 linear appliCaTionS 285 They will need 1623 hours or 16 hours 40 minutes (^23 of an hour is (^23) of 60 minutes— 2 3 ⋅ ...
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