(55+80+70+x)/4<=65

can you help me
205-205+x<=260-205
x<=55 is this right

( 55 + 80 + 70 + x ) / 4 <= 65 Multiply both sides with 4

55 + 80 + 70 + x <= 65 * 4

55 + 80 + 70 + x <= 260

x <= 260 - 55 - 80 - 70

x <= 55