Write and solve a proportion to answer the question. What number a is 70% of 70

1 answer:

7 0

Percent means parts out of 100
so 70%=70/100

'of' means multiply

we can do
$\frac{x}{70}=\frac{70}{100}$
that's the prooprtion

solving
$\frac{x}{70}=\frac{70}{100}$
$\frac{x}{70}=\frac{7}{10}$
times both sides by 70
$x=\frac{490}{10}$
$x=49$

the number is 49

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For the choir concert, the choir director has asked that everyone wear either black pants or blue jeans. Three times as many stu

Katyanochek1 [597]

Answer: 33 students wore blue jeans .

Step-by-step explanation:

Let x be the number of black pants.

Given : For the choir concert, the choir director has asked that everyone wear either black pants or blue jeans.

Three times as many students wore black pants as blue jeans.

i.e. Number of blue pants = 4x

If there are forty-four students in the choir, then we have

$x+3x=44\\\\\Rightarrow\ 4x=44$