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There are only 7 blue pens, 4 green pens and 6 red pens in a box. One pen is taken at random from the box. Write down the probability that this pen is blue.

First calculate the total number of pens in the bag by adding together the amounts of each different colour.7+4+6=17Since there are 7 blue pens to chose from out of a possible 17, the probability of choosing...
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Answered by Olivia R. • Maths tutor
7981 Views

Jenny has 3 stacks of coins - A B and C. Altogether the coins equal £1.30. Stack B has 3 times as much money has Stack A. Stack C has 2 times as much money as Stack B. How much money is in Pile C?

3 Stacks of coins - A B CAltogether the stacks add up to 130 pence (let's work in pence so its not too confusing). So, A+B+C=130pStack B has 3 times as much money has Stack A. So B = 3AStack C has 2 times as...
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Answered by Mayurey K. • Maths tutor
3350 Views

1: x = 2, 2: y = x + 5 -> Solve this pair of simultaneous equations.

A set of simultaneous equations most commonly represents two lines on a graph, or perhaps a circle, with a line running through it. When you solve a set of simultaneous equations, its important to remember t...
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Answered by Eddie B. • Maths tutor
3487 Views

La cigarette est un vrai problème chez les jeunes. Which social issue is being mentioned here?

Smoking among younger people
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Answered by Louis B. • French tutor
2934 Views

How do bacteria have a role in the nitrogen cycle?

This answer is best supported with a whiteboard All living things need nitrogen, but nitrogen gas is too unreactive for plants and animals to use directly. Bacteria's main role in the nitrogen cycle is to be...
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Answered by Katie D. • Biology tutor
14340 Views