how to solve this ?? plz help me
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Let us draw a line XY parallel to ST and passing through point R.
PQR + QRX = 180 (co-interior angles on the same side of transversal QR)
110 + QRX = 180
QRX = 70
Now,
RST +SRY = 180 (co-interior angles on the same side of transversal SR)
130 + SRY = 180
SRY = 50
XY is a straight line. RQ and RS stand on it.
QRX + QRS + SRY = 180
70 + QRS + 50 = 180
QRS = 180 - 120 = 60
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