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Akachukwu

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Find the number such that when 3/4 of it is added to 3 1/2 the sum is the same as when 2/3 of it is subtracted from 6 1/2
1. 1 answer
2. 114 views
The sum of two numbers is 21,3/4 of one of the number added to 2/3 of the other gives a sum of 15. Find the number
1. 2 answers
2. 109 views
A cube of 10cm and mass 0.5kg floats in a liquid with only one-fifth of it's height about the liquid surface.what is the
1. 4 answers
2. 1,314 views

3/4x+2/3y=15 -------------------- y=21-x 3/4x+2/3(21-x)=15 3/4x+14-2/3x=15 9/12x-8/12x=15-14 1/12x=1 x=(1/1)/(1/12) x=1/1*12/1 x=12 ------------------- 3/4*12+2/3y=15 9+2/3y=15 2/3y=15-9 y=6/(2/3) y=6*3/2 y=9 --------------- x+y=21 12+9=21
Recall the formular Tn=a+(n-1)d n=15 T15=a+(15-1)d =a+14d but 5th term=30 30=a+(5-1)d 30=a+4d ........(i) 20th term=75 75=a+(20-1)d 75=a+19d........(ii) from (i) make a the subject of the formular 30=a+4d a=30-4d.........(iii) sub (iii) into (ii)
Probability of a seed germinating means the probability of one seed germinating P(G)=1/3 P(not germinate)=1-1/3 =2/3 (a)P(none germinate)=2/3*2/3*2/3=8/27 (b)P(atleast one) using a tree diagram P(GGG or GGN or GNG or GNN or NGG or NGN or NNG) (1/3*1/3*1/3)

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