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Ganezh [65]
3 years ago
8

Which of the following expressions does not mean the same as the other three?

Mathematics
2 answers:
Goshia [24]3 years ago
6 0
X-(-17) because two negatives equal a positive, so the actual equation is x+17 while the others are x-17
Rashid [163]3 years ago
3 0

its number 3 :) X-(-17)

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Step-by-step explanation:

For concreatting a tower cement, sand, stones are in the ratio 1:2:4 For 144kg sand.. What amount of cement is required?

We are given the ratio

cement: sand:stones

= 1:2:4

The sum of proportion =

1 + 2 + 4 = 7

We are given the kg of sand = 144kg

Step 1

We find the total kg of cement, sand and stones = x

Using the proportion of sand,

2/7 of x = 144kg

2/7 × x = 144kg

2x/7 = 144kg

Cross Multiply

2x = 7 × 144kg

x = 7 × 144kg/2

x = 504kg

Therefore the total kg of cement, sand and stone = 504kg

Step 2

The amount of cement required is calculated as:

1/7 × 504 kg = 72 kg

Therefore, 72kg of cement is required.

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