hi,

1. let there be 20 units of oranges; so, 20 units (u) + 72 mangoes.

He sold 3/4 of mangoes, ie., 15 u + 54 mangoes

and 3/5 oranges, ie., 12 u oranges

He was left with 5 u + 18 mangoes and 8 u oranges.

ie., 8 u - (5 u + 18) = 15

3 u = 33

1 u = 11

Therefore, altogether he received

(15 x 11 + 54) x $2.75 + (12 x 11) x $0.55 = $674.85

2. [could be easiest solved using simultaneous equations, which some P6 kids do know how to do.

So, i try to show this approach. For other approaches, perhaps others could show how.]

Let there be g green clips and b blue clips.

Then, g - 44 : b = 4 : 5

ie., 5g - 220 = 4b

or, 5g = 4b + 220 ...... (1)

And, g : b - 20 = 6 : 5

ie., 5g = 6b - 120 ...... (2)

(2) - (1): 2b = 340

so that, b = 170

and g = 180

When add 150 blue into box, Percentage of blue in box in the end

= (150 + 170) / (150 + 170 + 180) x 100% = 64%

Cheerio, hope this is helpful,

jo sarah