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In a pack of sweets, the ratio of red to blue sweets is 7:5. If there are 25 blue sweets, how many red sweets are there?

Ratios are used to show how things are shared. A ratio of 7:5 means that for every 7 red sweets there are 5 blue sweets. Step 1 - 7 + 5 = 12 This means there are 12 parts to the ratio Step 2 -Blue sweets = 7...
HM
Answered by Holly M. • Maths tutor
6593 Views

A bag contains only 8 beads. The beads are identical in all respects except colour. 3 of the beads are black and the other 5 beads are white. A bead is taken at random from the bag and not replaced. A second bead is then taken at random from the bag. What

There are 8 beads in total; 3 out of 8 are black; 5 out of 8 are white. When the first bead is taken, there is a 3/8 chance of the bead being black, since 3 out of the 8 beads are black. Since the bead is no...
AC
Answered by Adam C. • Maths tutor
7446 Views

Solve 3x^2 + 13x + 14 = 0

Firstly, you need factorise.a = 3 b = 13 c = 14Find 2 numbers which add to make b(13) and multiply to make ac(42). These numbers are 6 and 7You can now split up the x coefficient to: 3x^2 + 6x + 7x + 14. You...
CW
Answered by Charles W. • Maths tutor
5952 Views

How do I factorise quadratic equations?

To factorise an expression such as x 2 - 8x + 15, you need to look for two numbers that add up to make -8 and multiply to give 15. The only option in this case is -5 and -3 (-5)+(-3)=-8and (-5)x(-3)=15as two...
MG
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How do I find the equation of a line that's perpendicular to another one?

Remember that the equation of a line is y=mx+c and m is the gradient of the line. The gradient of a perpendicular line will be the negative reciprocal of m ( that just means it will be -1/m). You can then us...
VP
Answered by Verity P. • Maths tutor
3754 Views