39.
131=[(82×18)+(152×w)]/(18+w)
2358+131w=1476+152w
2358-1476=152w-131w
882=21w
w=42
40.
x/120=56/(56+49)
x=(120×56)/105
x=64
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39.
131=[(82×18)+(152×w)]/(18+w)
2358+131w=1476+152w
2358-1476=152w-131w
882=21w
w=42
40.
x/120=56/(56+49)
x=(120×56)/105
x=64