A teacher 3

A teacher gives pens and pencils to elementary students at an equal rate, each classroom.

Pencils Pens
18 72
29 A
35 140
B 168

Determine the missing value for the letter B.

Correct answer:

B =  42

Step-by-step explanation:

r=72/18=4 r = A/29 A=29 r=29 4=116  r2=140/35=4  r = 168/B  B=168/r=168/4=42

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