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Verdich [7]
3 years ago
6

A student can solve 20 problems in 30 minutes. How long would it take him to solve 50 problems? (Assume that the student works a

t the same pace).
Mathematics
2 answers:
cupoosta [38]3 years ago
8 0

Student takes 75 minutes to solve 50 problems.

<u>SOLUTION: </u>

Given that, a student can solve 20 problems in 30 minutes.  

We have to find the time to solve 50 problems. (Assume that the student works at the same pace).

Now, we know that,  

\Rightarrow 20 \text { problems } \rightarrow 30 \text { minutes } \\\\ \text{Then, } 50 \text { problems } \rightarrow \text { (let it be) n minutes. }

So, by cross multiplication method,

\Rightarrow n \times 20=30 \times 50 \rightarrow 2 \times n=30 \times 5 \rightarrow 2 n=150 \rightarrow n=75

Cross multiplications steps: (To find Single Variable)

Step 1: Multiply the numerator of the left-hand fraction by the denominator of the right-hand fraction.

Step 2: Multiply the numerator of the right-hand fraction by the denominator of the left-hand fraction.

Step 3: Set the two products equal to each other.

Step 4: Solve for the variable.

Zigmanuir [339]3 years ago
3 0

Answer:

Step-by-step explanation:

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2 years ago
80% of what(?) games is 32 games..?
exis [7]
Answer=40 games

 32games    x games
________=________
    80%          100%

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divide both sides by 80
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3 0
3 years ago
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Help help help math math
solniwko [45]

Answer:

y=-1/2x-3

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Let's pick two points for slope.

\frac{-1+3}{-4-0}

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6 0
2 years ago
Gilbert is baking cookies and brownies for a bake sale. It costs him $3 for every batch of cookies he makes and $4 for every bat
Brilliant_brown [7]
Let c=the number of batches for the cookies; b=that for the brownies.
If $P=the profit, then
maximize P=5c+4.5b, subject to the constaints:
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The simplest way to find the suitable b & c is
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