It's real easy, but, its somewhat confusing question for me?

Question

a quality control engineer finds an average of 4 deective partsin every 80 parts.

one month later, the engineer has gathered 243 defective parts. how many parts are there in total

Also what can i do to improve on word problems im really bad at it, always was, especially in math overall! , please some tips?

Answer 1

Use dimentional analysis all the time. write down the units and check that they cancel correctly, and give you the units that you want in the answer.

4 bad / 80 parts = 0.05 bad/part

243 bad / 0.05 bad/part = 4860 parts

.

Answer 2

% DEFECTIVE PARTS=4/80 *100=5%

NOW 5%=243

SO 100%=243*100/5=4860 ANS

MATHS NEEDS CONCENTRATION.

Answer 3

We can  just form a ratio like

80/4 = x/243 --- (Out of 80 parts there were 4 defectives, how many parts are there if the defectives were 243?)

cross multiply

4x = 19440

so

x = 4860

The reason all of you have trouble with word problems is because they force you to think. All the previous problem types all you had to do was follow a set of rules and crank out an answer. For word problems, write down in equation form everything you know. Usually, there will be 2 equations and 2 unknowns, You can eliminate one variable using algebra you already know. Go for it.

regards,

blue

Answer 4

Find the percentage of bad parts or set up a ratio

Ratio 4 is to 80 as 243 is to x

that becomes fractional equation

4/80=243/x

Solve by cross multiplying

4x=80(243)

4x=19440

x=19440/4 = 4860

Try to learn the technique more than anything. Get your basic adding, subtracting, multiplying down good. Have your teacher give you some tips on the homework to start you off. keep coming to Yahoo Answers!