maths

the weight of 4 boxes together is 66.5kg.the weight of box B is 2kg less than box A.and the weight of box C is 1.5kg more than box A.if the weight of box D is 1.5kg more than box C.find the weight of each box

1. look at what we have:

a+b+c+d = 66.5
b = a-2
c = a+1.5
d = c+1.5

Start substituting:

a+(a-2)+(a+1.5)+((a+1.5)+1.5) = 66.5
a=16.0
b=14.0
c=17.5
d=19.0

posted by Steve
2. b = a-2
c = a+1.5
d = c+1.5 = a+1.5 + 1.5 = a+3

a+b+c+d = 66.5
a + a-2 + a+1.5 + a+3 = 66.5
4a = 64
a= 16

box A = 16
box B = 14
box C = 17.5
box D = 19

check:
sum = 66.5
All is good.

posted by Reiny

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