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John bought 7 bags of cement and 3 bags of gravel with the total weight of 215kgs. Shona bought 5 bags of cement and 4 bags of gravel with the total weight of 200kgs. How much does 1 bag of cement weigh and how much does 1 bag of gravel weigh?

Step 1: Write down the information we got in a simplified form => cement (c) .... 7 bags .... 5 bags, gravel (g) ...... 3 bags .... 4 bags, total weight .. 215kgs ... 200kgs ... Step 2: Transfer into 2 eq...
JV
Answered by Jana V. • Maths tutor
7763 Views

Find x in: 2(x-2) = 3x+9

2(x-2) = 3x+9LHS = RHS2x-4 = 3x+92x-3x = 9+4-x = 13x = -13
FO
Answered by Folorunso O. • Maths tutor
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Expand and simplify: (x+7)(x+3)

This is a question that requires multiple steps, and in the exam may be worth around 3 marks. One will be for expanding, one for simplifying, and one mark for working.First step: expand the brackets. This co...
LS
Answered by Lily S. • Maths tutor
11889 Views

Factorise the expression: 8x + 32

8x + 32 Highest common factor of 8 and 32 is 8 8/8 = 132/8 = 4 8x + 32 - divide through by 8 8(x + 4) We can check this by multiplying out: 8(x + 4) 8 * x = 8x 8 * 4 = 32Hence8(x+4) when multiplied out = 8x ...
RC
Answered by Rob C. • Maths tutor
5399 Views

Prove that the square of an odd number is always 1 more than a multiple of 4

(2n+1) 2 = (2n+1)(2n+1) Use FOIL method= 4n 2 +2n+2n+1= 4n 2 +4n+1= 4(4n+n)+1 4n+n is just a number, therefore proved
DH
Answered by Daniel H. • Maths tutor
2775 Views