Answer:
first find the total = 5+3=8
now 5/8×640 =5×80 = 400 rupees
3/8×640 =3×80 = 240 rupees
so Bishu gets 400 rupees and Arpana gets 240 rupees.
hope you understood!!
a/q ratio 5:3 total money is divided in 8 parts so 1 part =rs 80 so b&a got 80×5=400 & 80×3 =240 resp
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