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Harry mixes white paint and blue paint in the ratio 2:5. He makes a total of 21 litres of paint. How much more blue paint does he need to add to the mixture so that the ratio of white paint to blue paint becomes 1:4?

W:B = 2:5 Total of 21 litres of paint. We want a ratio of W:B = 1:4 = 2:8 Therefore we must add 3 parts of blue paint 2 + 5 = 7 parts total7 parts = 21L1 part = 3L3 parts = 9L Therefore must add 9L of blue p...
JB
Answered by James B. • Maths tutor
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20cm3 of 0.5moldm-3 of HCL is diluted by adding 15cm3 of water. This diluted solution is titrated against a 0.3moldm-3 solution of NaOH. What is the volume of the NaOH in cm3 required to reach the endpoint of the titration?

We need to calculate how many moles of HCl are being titrated. This is the volume in dm3 times the concentration (trick: you can do dimensional analysis if unsure of the formula): number of moles of HCl = 0....
Answered by • Chemistry tutor
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Calculate 3/4+3/4*5/7 ?

so we need to know the understanding of BODMAS, hoe to add fractions, how to multiply fractions, how to simplify fractions.Answer:9/7
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Answered by Anand K. • Maths tutor
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Find the stationery points of x^3 + 3x^2 - 24x + 7 and determine whether the slope is increasing or decreasing at x=3.

i) We must differentiate the equation and set it equal to 0 to find stationery points: dy/dx = 3x 2 + 6x + 24=0 Note we can take out a factor of 3 x 2 + 2x - 8=0 Factorise (x-2)(x+4)=0 State x values x=2 or ...
MM
Answered by Michael M. • Maths tutor
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Name and explain the formation of the river landform labelled A in Resource 1. (Waterfall Formation - 6 marks)

A waterfall, labelled A in resource 1, normally forms in the upper valley of rivers where alternating bands of hard and soft rock occur along the river bed. The bands of softer rock are eroded at a faster ra...
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Answered by Joshua E. • Geography tutor
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