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Earlier discussion
1 older comment kept for context.
Oluwaseun Adeyemi
SRT is a straight line, where QRT = 120
SRQ = 180\(^{\circ}\) - 120\(^{\circ}\) = 60\(^{\circ}\) - (angle on a straight line)
also angle QRS = 180\(^{\circ}\) - 100\(^{\circ}\) (angle on a straight line) . In angles where QR = SR and angle SRQ = 60\(^{\circ}\)
x = 100 - 60 = 40\(^{\circ}\)