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White paint costs £2.80 per litre. Blue Paint costs £3.50 per litre. White paint and blue paint are mixed in the ratio 3:2 Work out the cost of 18 litres of the mixture.

The mixture has a ratio of 3:2, white to blue paint. 3+2=5 so there are 5 parts to the mixture, 3 white and 2 blue. We know the cost of 1 litre of each, so first we can work out the cost of 1 litre of the mi...
HB
Answered by Henry B. • Maths tutor
8433 Views

Explain why an atom has no overall charge.

An atom is comprised of protons, neutrons, and electrons. Protons have positive charge and the number of protons is dictated by the proton number, which is the same as the number of electrons, which have neg...
JC
Answered by James C. • Chemistry tutor
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To what extent was the ideological divide between the west and the USSR responsible for the development of the Cold War?

This essay will argue that whilst the ideological divide was extremely significant, it was not the sole responsible factor in the development of the cold war. Arguments that support it being responsible: -Fo...
HN
Answered by Halima N. • History tutor
3740 Views

If z=4+i, what is 1/z? (in the form a+bi)

1/z =1/(4+i) Multiply both top and bottom by the complex conjugate, z* = 4 - i, 1/z = (4-i)/((4+i)(4-i)) = (4-i)/(16+4i-4i-i 2 ) = (4-i)/17 ans: 4/17 - i/17
RH
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Anouk, Beth and Carlin share £48 between them. Beth gets 3/8 of the money. Anouk and Carlin share the remaining money between them, by the ratio 3:2. How much money does Carlin get?

Beth gets: £48 x 3/8 = £18 The remaining money is: £48 - £18 = £30 ( Alternate method: £48 x 5/8 = £30. This eliminates the need for the first step) The ratio is 3:2 so this is the same as fractions of (3+2=...
RH
Answered by Rachel H. • Maths tutor
3743 Views