Question

Mrs Stanley can scream at a rate of 120 words per minute when she is in a good mood and she can scream at a rate of 150 words per minute when she is angry. Yesterday she has screamed 3120 words for a total of 23 minutes. For how many minutes was Mrs Stanley angry?
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Answer 1

Answer:

12 minuts

Step-by-step explanation:

As we know that in anger Mrs Stanley can scream 150 words per minute. and 120 words in good mood

according to question she screamed 3120 words in 23 minuts.

now let us consider that Mr Stanley was angry for X mintus

X×150+(23-x)×120= 3120

150x+2760-120X= 3120

30x = 3120-2760

30x = 360

X = 12

it means she was angry for 12 mintus