In 1985, the Economic Cooperation Organization (ECO) was established by Iran, Pakistan, and Turkey to promote economic, technical, and cultural cooperation among the member states. ECO is the successor organization of Regional Cooperation for Development (RCD) which remained in existence since 1964 up to 1979.
64.889% of 399.879 + √? = 54.90% of 799.80 – 44.03% of 400.21
647.1 ÷ ? + 72.3 × 209.81 – 8743.1 = 6404
³√? `xx` 32.87 + 59.83 `xx` 28.7665 – 48.8745 `xx` 21.642 = 1085.344
? = 21.08 + 18.99 × 21.07
80.22 of 149.98% + 459.99 ÷ 23.18 = ?
(16.16 × 31.98) + 24.15% of 649.99 = ? + 124.34
(?)2 + 4.113 = 24.92 – 32.03
11.69% of 499.78 + (2.89 × 39.76) = ?
25, 28, 26, 29, 27, ?
