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Solve 67x – 5 = 12x + 13

First of all, we put all the unknowns to the same side. 67x and 12x will be on the left hand side; 13 and -5 are on the right hand side. For the unknowns, when 12x moves from right hand side to the left hand...
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Answered by Charmaine N. • Maths tutor
3665 Views

how to convert a decimal into a fraction, let the decimal be 0.75

let it be 0.75/1 (every number is a fraction over 1)this can then be written as 75/100, this can then be simplified to 15/20 when both top and bottom are divided by 5. This is not yet the smallest form as it...
Answered by • Maths tutor
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In a group of 40 people, 16 owned at least a phone, 7 owned only a tablet and it's known 13 owned both. What's the probability that a person, picked at random, owned neither?

40 people in total16 = at least a phone, 7 = only a tablet, 13 = both Must figure out how many people just own a phone: 16 - 13 (both phones and tablet) = 3 (just own a phone) So, can construct a Venn diagra...
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Answered by Milan R. • Maths tutor
3486 Views

Gavin, Harry and Isabel each earn the same salary. Gavin saves 28% of his salary. Harry spends 3/4 of his salary and saves the rest. The amount Isabel saves:The amount she spends=3:7. Who saves the most?

To work out who saved the most we will need to compare the amounts they all saved which we can do easily when they're all in the same form. the easiest one to convert to is percentages because all the values...
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Answered by Raneem D. • Maths tutor
11061 Views

3x + y = -4; 3x -4y = 6; Solve the simultaneous equations for x and y

x = -2/3y = -2
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Answered by Jack B. • Maths tutor
4289 Views