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kow [346]
3 years ago
10

The sum of 21 and a number is 30

Mathematics
1 answer:
vagabundo [1.1K]3 years ago
5 0
The answer is 9, because you subtract 21 from 30 and you get 9. When you add 21+9 you get 30.
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Question in English:

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3 years ago
Amlyah increased her bench press
NikAS [45]
<h3>Answer:  20% increase</h3>

======================================================

Explanation:

A = old value = 110

B = new value = 132

C = percent change

C = 100*(B-A)/A

C = 100*(132-110)/110

C = 20%

The positive C value means we have a percent increase, which corresponds to the fact that A = 110 increases to B = 132.

The B-A = 132-110 = 22 portion up top indicates that the increase is 22 pounds, which when divided over 110, gets us 22/110 = 0.20 = 20%

---------------

Checking the answer:

20% of 110 = 0.20*110 = 22

She's able to lift 22 extra pounds on top of the 110 pounds she can handle previously, so she can now lift 110+22 = 132 pounds. The answer is confirmed.

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3 years ago
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Sonbull [250]
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Answer:

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Step-by-step explanation:

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