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Mice21 [21]
3 years ago
14

If 21 = 42 39 = 618 17 = 214 then what does 45 = ?

Mathematics
1 answer:
Brums [2.3K]3 years ago
3 0

Answer:

810

Step-by-step explanation:

21 = 42

Decode:

Number in the tens place = 2 x 2 = 4

Number in the ones place = 1 x 2 = 2

Answer: 42

39 = 618

Decode:

Number in the tens place = 3 x 2 = 6

Number in the ones place = 9 x 2 = 18

Answer: 618

17 = 214

Decode:

Number in the tens place = 1 x 2 = 2

Number in the ones place = 7 x 2 = 14

Answer: 214

Find 45

Number in the tens place = 4 x 2 = 8

Number in the ones place = 5 x 2 = 10

Answer: 810

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Irina-Kira [14]

Answer:

(a)2000\text{ ml} (b)40\text{ ml and }60\text{ ml} (c)NO

Step-by-step explanation:

GIVEN: Solution A is an \$80\% acid solution. Solution B is a \$30\% acid solution.

TO FIND: (a) Find the amount of Solution A (in mL) that must be added to 500 \text{ml} of Solution B in order to produce a 70\% acid solution. (b) Find the amount of Solution A and Solution B (in mL) that can be combined in order to form a 100 \text{ml} solution that is 50\% acid. (c) Does there exist a combination of Solution A and Solution B that is 90\% acid.

SOLUTION:

(a)

Let total amount of solution A added be x

Total amount of mixture =500+x\text{ ml}

As resulting solution is  70\% acid solution.

Amount of acid in final solution is sum of acid in both solutions

\frac{70}{100}(500+x)=\frac{80}{100}x+\frac{30}{100}\times500

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(b)

Let amount of Solution A be x\text{ ml}

Amount of solution B =100-x\text{ ml}

As resulting solution is 50\% acidic solution

Amount of acid in final solution is sum of acid in both solutions

\frac{50}{100}\times100=\frac{80}{100}x+\frac{30}{100}(100-x)

5000=80x+3000-30x

50x=2000

x=40\text{ ml}

Amount of solution B =100-40=60\text{ ml}

(c)

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34 is the answer to this question
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Answer:

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Step-by-step explanation:

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