A fruit vendor in Indra Vihar is selling frits by a faulty balance. He uses correct weight, but he has tied a thread of mass `100 gm` at a distance of `4 cm` from the hinge as shown. Your buy `250 gm` of grapes. How many `gm` grapes do you actually get ?
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Answer

`0210`

Explanation

Balancing moment of force about hindge `250 xx g xx 10 = 100 xx g xx 4 + m xx g xx 10`
`m = 210 gm`.