On 1 May 2012, the cost of 5 grams of gold was 14 000 rupees. The cost of gold decreased by 7.5% from 1 May 2012 to 1 May 2013

Work out the cost of 20 grams of gold on 1 May 2013

51,800 rupees

Step-by-step explanation:

Cost of 5 grams of gold on 1 May 2012 = 14 000 rupees.

The cost of gold decreased by 7.5% from 1 May 2012 to 1 May 2013

Cost of 5 grams of gold on 1 May 2013 = 14,000 - 7.5% of 14,000

= 14,000 - 0.075 × 14,000

= 14,000 - 1,050

= 12,950 rupees

Work out the cost of 20 grams of gold on 1 May 2013

Since, there are four 5 grams of gold in 20 grams of gold

Therefore,

Cost of 20 grams of gold on 1 May 2013 = 12,950 rupees × 4

= 51,800 rupees

infinitely many solutions

step-by-step explanation:

we have been given the equation;

2(2x + 3) = -4 + 2(2x + 5)

we need to determine the value of x.

2(2x + 3), we expand this expression to obtain 4x + 6

similarly 2(2x + 5) will become 4x + 10

now we have;

4x + 6 = -4 + 4x + 10

4x + 6 = 4x + 10 - 4

4x + 6 = 4x + 6

the expression on the left hand side is identical to the one on the right hand side. therefore, we are looking at just a single straight line whose equation is;

y = 4x + 6

consequently, we shall have infinitely many solutions