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what is half of five-eights as a percentage?

(1/2)x(5/8)=5/16 100/16=6.25 6.25 x 5 = 31.25
DM
Answered by Devshi M. • Maths tutor
4072 Views

Talil is going to make some concrete mix. He needs to mix cement, sand and gravel (1: 3:5) by weight. Talil wants to make 180 kg of concrete mix. He has 15 kg of cement, 85 kg of sand, 100 kg of gravel. Does he have enough to make the concrete?

In order to answer this question you need to find out how much cement, sand and gravel is needed to make 180kg of concrete mix. To do this you must find out how many parts the concrete mix ratio is made up (...
KM
Answered by Katie M. • Maths tutor
34397 Views

John has 12 marbles. Sandra has 10 more marbles than Kathy. Kathy has 4 times as many marbles as John. How many marbles does Sandra have?

This question asks how students can formulate linear equations from worded questions. The first step is to give each person an algabraic symbol. j for John, s for Sandra and k for Kathy works fine. Next, stu...
JW
Answered by James W. • Maths tutor
5595 Views

I have a bag with 4 different coloured marbles. Blue, green, red, and orange. I have 2x,7,7x + 5,4x -3 of each coloured marble respectively. If the probability of a green marble being picked is 7/100, find the probability of an orange marble being picked.

Let's reorgansie the information we've been provided with in the question: Colour of marble - number of marbles in the bag Blue - 2x Green - 7 Red - 7x + 5 Orange - 4x - 3 Probability of the green marble bei...
GM
Answered by Georgina M. • Maths tutor
5193 Views

Simplify the expression: (x^2 + x - 6)/(3x^2 + 9x)

Factorise the numerator: x^2 + x - 6 = (x+3)(x-2) Factorise the denominator: 3x^2 + 9x = 3x(x+3) Cancel '(x+3)' Answer: (x-2)/3x
RD
Answered by Richard D. • Maths tutor
4328 Views